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RESEARCH ARTICLE

Good science for improving policy: greenhouse gas emissions from agricultural manures

Chris Pratt A C , Matthew Redding A , Jaye Hill A , Andrew Shilton B , Matthew Chung B and Benoit Guieysse B
+ Author Affiliations
- Author Affiliations

A Department of Agriculture, Fisheries and Forestry, 203 Tor Street, Toowoomba, Qld 4350, Australia.

B School of Engineering, Massey University, Palmerston North 4472, New Zealand.

C Corresponding author. Email: christopher.pratt@daff.qld.gov.au

Animal Production Science 55(6) 691-701 https://doi.org/10.1071/AN13504
Submitted: 25 November 2013  Accepted: 7 May 2014   Published: 1 September 2014

Abstract

Australia’s and New Zealand’s major agricultural manure management emission sources are reported to be, in descending order of magnitude: (1) methane (CH4) from dairy farms in both countries; (2) CH4 from pig farms in Australia; and nitrous oxide (N2O) from (3) beef feedlots and (4) poultry sheds in Australia. We used literature to critically review these inventory estimates. Alarmingly for dairy farm CH4 (1), our review revealed assumptions and omissions that when addressed could dramatically increase this emission estimate. The estimate of CH4 from Australian pig farms (2) appears to be accurate, according to industry data and field measurements. The N2O emission estimates for beef feedlots (3) and poultry sheds (4) are based on northern hemisphere default factors whose appropriateness for Australia is questionable and unverified. Therefore, most of Australasia’s key livestock manure management greenhouse gas (GHG) emission profiles are either questionable or are unsubstantiated by region-specific research. Encouragingly, GHG from dairy shed manure are relatively easy to mitigate because they are a point source which can be managed by several ‘close-to-market’ abatement solutions. Reducing these manure emissions therefore constitutes an opportunity for meaningful action sooner compared with the more difficult-to-implement and long-term strategies that currently dominate agricultural GHG mitigation research. At an international level, our review highlights the critical need to carefully reassess GHG emission profiles, particularly if such assessments have not been made since the compilation of original inventories. Failure to act in this regard presents the very real risk of missing the ‘low hanging fruit’ in the rush towards a meaningful response to climate change.

Additional keywords: manure management, methane, mitigation, nitrous oxide.


References

Akiyama H, Yagi K, Yan X (2005) Direct N2O emissions from rice paddy fields: summary of available data. Global Biogeochemical Cycles 19, GB1005
Direct N2O emissions from rice paddy fields: summary of available data.Crossref | GoogleScholarGoogle Scholar |

ALFA (2013) Australian Lot Feeders’ Association. Available at http://www.feedlots.com.au/ [Verified 23 July 2014]

Australian Government (2013) ‘Australian National Greenhouse Accounts – National Inventory Report 2011. Volume 1.’ (Australian Government: Canberra, ACT)

Beauchemin KA, McGinn SM (2006) Methane emissions from beef cattle: effects of fumaric acid, essential oil, and canola oil. Journal of Animal Science 84, 1489–1496.

Boadi D, Benchaar C, Chiquette J, Massé D (2004) Mitigation strategies to reduce enteric methane emissions from dairy cows: Update review. Canadian Journal of Animal Science 84, 319–335.
Mitigation strategies to reduce enteric methane emissions from dairy cows: Update review.Crossref | GoogleScholarGoogle Scholar |

Borhan MS (2011) Greenhouse gas emissions from ground level area sources in dairy and cattle feedyard operations. Atmosphere (Toronto) 2, 303–329.
Greenhouse gas emissions from ground level area sources in dairy and cattle feedyard operations.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3MXhtFGksbjF&md5=d12f29374260f90a40d9ab94fda7b700CAS |

Bouwman AF, Boumans LJM, Batjes NH (2002a) Emissions of N2O and NO from fertilized fields: summary of available measurement data. Global Biogeochemical Cycles 16, 1058
Emissions of N2O and NO from fertilized fields: summary of available measurement data.Crossref | GoogleScholarGoogle Scholar |

Bouwman AF, Boumans LJM, Batjes NH (2002b) Modeling global annual N2O and NO emissions from fertilized fields. Global Biogeochemical Cycles 16, 1080
Modeling global annual N2O and NO emissions from fertilized fields.Crossref | GoogleScholarGoogle Scholar |

Brumme R, Borken W, Finke S (1999) Hierarchical control on nitrous oxide emission in forest ecosystems. Global Biogeochemical Cycles 13, 1137–1148.
Hierarchical control on nitrous oxide emission in forest ecosystems.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD3cXkt12luw%3D%3D&md5=e2a0cd9655c40e48f5a254c6a4577367CAS |

Butterbach-Bahl K, Gasche R, Breuer L, Papen H (1997) Fluxes of NO and N2O from temperate forest soils: impact of forest type, N deposition and of liming on the NO and N2O emissions. Nutrient Cycling in Agroecosystems 48, 79–90.
Fluxes of NO and N2O from temperate forest soils: impact of forest type, N deposition and of liming on the NO and N2O emissions.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DyaK2sXmt1Wltrk%3D&md5=d1230865ab25cddeb784f177a7c9520eCAS |

Canh TT, Aarnink AJA, Schutte JB, Sutton A, Langhout DJ, Verstegen MWA (1998) Dietary protein affects nitrogen excretion and ammonia emission from slurry of growing–finishing pigs. Livestock Production Science 56, 181–191.
Dietary protein affects nitrogen excretion and ammonia emission from slurry of growing–finishing pigs.Crossref | GoogleScholarGoogle Scholar |

Chadwick DR (2005) Emissions of ammonia, nitrous oxide and methane from cattle manure heaps: effect of compaction and covering. Atmospheric Environment 39, 787–799.
Emissions of ammonia, nitrous oxide and methane from cattle manure heaps: effect of compaction and covering.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD2MXktVChsg%3D%3D&md5=44c969925fbf7cc197d7f9e0dc7ac754CAS |

Chung ML, Shilton AN, Guieysse B, Pratt C (2013) Questioning the accuracy of greenhouse gas accounting from agricultural waste: a case study. Journal of Environmental Quality 42, 654–659.
Questioning the accuracy of greenhouse gas accounting from agricultural waste: a case study.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3sXntVCnsLY%3D&md5=76d30e57ea1dcede0257122591cb028bCAS |

Corre M, Pennock D, Kessel C, Kirkelliott D (1999) Estimation of annual nitrous oxide emissions from a transitional grassland-forest region in Saskatchewan, Canada. Biogeochemistry 44, 29–49.
Estimation of annual nitrous oxide emissions from a transitional grassland-forest region in Saskatchewan, Canada.Crossref | GoogleScholarGoogle Scholar |

Cottle DJ, Nolan JV, Wiedemann SG (2011) Ruminant enteric methane mitigation: a review. Animal Production Science 51, 491–514.
Ruminant enteric methane mitigation: a review.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3MXntVGisLY%3D&md5=5199c518bcbf607cd2261a9a90b2975eCAS |

Craggs R, Park J, Heubeck S (2008) Methane emissions from anaerobic ponds on a piggery and a dairy farm in New Zealand. Australian Journal of Experimental Agriculture 48, 142–146.
Methane emissions from anaerobic ponds on a piggery and a dairy farm in New Zealand.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD1cXovVyl&md5=0072573662de16f87423654c613280d8CAS |

Dairy Australia (2013) Feeding systems used by Australian dairy farmers. Available at http://www.dairyaustralia.com.au/~/media/Documents/Animals%20feed%20and%20environment/Feed%20and%20nutrition/Feeding%20Systems%20latest/Aus%20five%20main%20feeding%20systems.pdf [Verified 1 February 2014]

Dalal RC, Wang W, Robertson GP, Parton WJ (2003) Nitrous oxide emission from Australian agricultural lands and mitigation options: a review. Soil Research 41, 165–195.
Nitrous oxide emission from Australian agricultural lands and mitigation options: a review.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD3sXktFKisr8%3D&md5=6d27adaa97cbf6dc2b400808d837528dCAS |

Dantzman CL, Richter MF, Martin FG (1983) Chemical elements in soils under cattle pens. Journal of Environmental Quality 12, 164–168.
Chemical elements in soils under cattle pens.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DyaL3sXhvFKqurk%3D&md5=a3002db587e2525a599ac0c7ea520aeaCAS |

de Klein CAM, Sherlock RR, Cameron KC, van der Weerden TJ (2001) Nitrous oxide emissions from agricultural soils in New Zealand – a review of current knowledge and directions for future research. Journal of the Royal Society of New Zealand 31, 543–574.
Nitrous oxide emissions from agricultural soils in New Zealand – a review of current knowledge and directions for future research.Crossref | GoogleScholarGoogle Scholar |

Denier van der Gon H, Bleeker A (2005) Indirect N2O emission due to atmospheric N deposition for the Netherlands. Atmospheric Environment 39, 5827–5838.
Indirect N2O emission due to atmospheric N deposition for the Netherlands.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD2MXhtVShtbfE&md5=589eca41883a1c97baa6c2d5e98f4752CAS |

Denmead OT, Chen D, Griffith DWT, Loh ZM, Bai M, Naylor T (2008) Emissions of the indirect greenhouse gases NH3 and NOx from Australian beef cattle feedlots. Australian Journal of Experimental Agriculture 48, 213–218.
Emissions of the indirect greenhouse gases NH3 and NOx from Australian beef cattle feedlots.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD1cXovV2l&md5=d7a3b5bc684f37a8a321ba83e03acb86CAS |

Dobbie KE, Smith KA (2001) The effects of temperature, water-filled pore space and land use on N2O emissions from an imperfectly drained gleysol. European Journal of Soil Science 52, 667–673.
The effects of temperature, water-filled pore space and land use on N2O emissions from an imperfectly drained gleysol.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD38XltVKqtA%3D%3D&md5=8a75d7d2c7da73d5fd0228c9a3efc4ecCAS |

Eckard RJ, Grainger C, de Klein CAM (2010) Options for the abatement of methane and nitrous oxide from ruminant production: a review. Livestock Science 130, 47–56.
Options for the abatement of methane and nitrous oxide from ruminant production: a review.Crossref | GoogleScholarGoogle Scholar |

Gourley CJP, Powell JM, Dougherty WJ, Weaver DM (2007) Nutrient budgeting as an approach to improving nutrient management on Australian dairy farms. Australian Journal of Experimental Agriculture 47, 1064–1074.
Nutrient budgeting as an approach to improving nutrient management on Australian dairy farms.Crossref | GoogleScholarGoogle Scholar |

Grainger C, Auldist MJ, Clarke T, Beauchemin KA, McGinn SM, Hannah MC, Eckard RJ, Lowe LB (2008) Use of monensin controlled-release capsules to reduce methane emissions and improve milk production of dairy cows offered pasture supplemented with grain. Journal of Dairy Science 91, 1159–1165.
Use of monensin controlled-release capsules to reduce methane emissions and improve milk production of dairy cows offered pasture supplemented with grain.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD1cXivFemtb8%3D&md5=56d745acd3276fa4556b5b54e10fec64CAS |

Hayes ET, Leek ABG, Curran TP, Dodd VA, Carton OT, Beattie VE, O’Doherty JV (2004) The influence of diet crude protein level on odour and ammonia emissions from finishing pig houses. Bioresource Technology 91, 309–315.
The influence of diet crude protein level on odour and ammonia emissions from finishing pig houses.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD3sXos1OntLg%3D&md5=bfae25db97db9ff2635e946dd71727eeCAS |

Hill J (2012) ‘Recalculate pork industry emissions inventory.’ (Massey University: Palmerston North, New Zealand)

Hutchings NJ, Sommer SG, Andersen JM, Asman WAH (2001) A detailed ammonia emission inventory for Denmark. Atmospheric Environment 35, 1959–1968.
A detailed ammonia emission inventory for Denmark.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD3MXhslOgsL4%3D&md5=46274d9ab1f53ae7fdfd74b814545d76CAS |

IPCC (2006) ‘Emissions from livestock and manure management. IPCC guidelines for national greenhouse gas inventories. Vol. 4.’ (IPCC: Kanegawa, Japan)

Külling DR, Menzi H, Sutter F, Lischer P, Kreuzer M (2003) Ammonia, nitrous oxide and methane emissions from differently stored dairy manure derived from grass- and hay-based rations. Nutrient Cycling in Agroecosystems 65, 13–22.
Ammonia, nitrous oxide and methane emissions from differently stored dairy manure derived from grass- and hay-based rations.Crossref | GoogleScholarGoogle Scholar |

Ledgard S, Brier G (2004) ‘Estimation of the proportion of animal excreta transferred to the farm dairy effluent system.’ (New Zealand Ministry for Agriculture and Forestry: Wellington, New Zealand)

Loh Z, Chen D, Bai M, Naylor T, Griffith D, Hill J, Denmead T, McGinn S, Edis R (2008) Measurement of greenhouse gas emissions from Australian feedlot beef production using open-path spectroscopy and atmospheric dispersion modelling. Australian Journal of Experimental Agriculture 48, 244–247.
Measurement of greenhouse gas emissions from Australian feedlot beef production using open-path spectroscopy and atmospheric dispersion modelling.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD1cXovVOl&md5=87e931604f83b24b821ecbcdfe0963a0CAS |

Mangino J, Bartram D, Brazy A (2001) Development of a methane conversion factor to estimate emissions from animal waste lagoons. In ‘US EPA’s 17th annual emission inventory conference, Atlanta’.

Maraseni TN, Maroulis J (2008) Piggery: from environmental pollution to a climate change solution Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes 43, 358–363.

McGrath RJ, Mason IG (2004) An observational method for the assessment of biogas production from an anaerobic waste stabilisation pond treating farm dairy wastewater. Biosystems Engineering 87, 471–478.
An observational method for the assessment of biogas production from an anaerobic waste stabilisation pond treating farm dairy wastewater.Crossref | GoogleScholarGoogle Scholar |

MLA (2013) ‘MLA cattle.’ Available at http://www.mla.com.au/About-the-red-meat-industry/Industry-overview/Cattle [Verified 23 July 2014]

Monaghan RM, Smith LC, de Klein CAM (2013) The effectiveness of the nitrification inhibitor dicyandiamide (DCD) in reducing nitrate leaching and nitrous oxide emissions from a grazed winter forage crop in southern New Zealand. Agriculture, Ecosystems & Environment 175, 29–38.
The effectiveness of the nitrification inhibitor dicyandiamide (DCD) in reducing nitrate leaching and nitrous oxide emissions from a grazed winter forage crop in southern New Zealand.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3sXhtVSls7rF&md5=28887430960b5b87998b008b1fe1f03fCAS |

Monteny G-J, Bannink A, Chadwick D (2006) Greenhouse gas abatement strategies for animal husbandry. Agriculture, Ecosystems & Environment 112, 163–170.
Greenhouse gas abatement strategies for animal husbandry.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD28Xktl2lsA%3D%3D&md5=30ce8bb5f06452b75f2b8b954e02539dCAS |

Montes F, Meinen R, Dell C, Rotz A, Hristov AN, Oh J, Waghorn G, Gerber PJ, Henderson B, Makkar HP, Dijkstra J (2013) Mitigation of methane and nitrous oxide emissions from animal operations: II. A review of manure management mitigation options Journal of Animal Science.
Mitigation of methane and nitrous oxide emissions from animal operations: II. A review of manure management mitigation optionsCrossref | GoogleScholarGoogle Scholar |

Muir SK, Chen D, Rowell D, Hill J (2011) Development and validation of a biophysical model of enteric methane emissions from Australian beef feedlots. In ‘Modelling nutrient digestion and utilisation in farm animals’. (Eds D Sauvant, J Milgen, P Faverdin, N Friggens) pp. 412–420. (Wageningen Academic Publishers: Wageningen, The Netherlands)

NZAGRC (2011) New Zealand Agricultural Greenhouse Gas Research Centre (NZAGRC). Annual Report. Available at http://www.nzagrc.org.nz/annual-reports.html [Verified 23 July 2014]

NZAGRC (2012) New Zealand Agricultural Greenhouse Gas Research Centre (NZAGRC). Funding. Available at http://www.nzagrc.org.nz/funding.html [Verified 23 July 2014]

New Zealand Government (2013) ‘New Zealand’s Greenhouse Gas Inventory 1990–2011.’ (Ministry for the Environment: Wellington, New Zealand)

O’Neill BF, Deighton MH, O’Loughlin BM, Mulligan FJ, Boland TM, O’Donovan M, Lewis E (2011) Effects of a perennial ryegrass diet or total mixed ration diet offered to spring-calving Holstein-Friesian dairy cows on methane emissions, dry matter intake, and milk production. Journal of Dairy Science 94, 1941–1951.
Effects of a perennial ryegrass diet or total mixed ration diet offered to spring-calving Holstein-Friesian dairy cows on methane emissions, dry matter intake, and milk production.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3MXnvFChtbg%3D&md5=aa90194ac13e7a7f36984d6cd3b91765CAS |

Patra A (2012) Enteric methane mitigation technologies for ruminant livestock: a synthesis of current research and future directions. Environmental Monitoring and Assessment 184, 1929–1952.
Enteric methane mitigation technologies for ruminant livestock: a synthesis of current research and future directions.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC38XjtFOjsbw%3D&md5=9e64ac094587284030a2ef77e59c3539CAS |

Pattey E, Trzcinski MK, Desjardins RL (2005) Quantifying the reduction of greenhouse gas emissions as a result of composting dairy and beef cattle manure. Nutrient Cycling in Agroecosystems 72, 173–187.
Quantifying the reduction of greenhouse gas emissions as a result of composting dairy and beef cattle manure.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD2MXhtVKitrfE&md5=738ad73e564a2314d6427bcd2b83ac81CAS |

Piccand V, Cutullic E, Meier S, Schori F, Kunz PL, Roche JR, Thomet P (2013) Production and reproduction of Fleckvieh, Brown Swiss, and 2 strains of Holstein-Friesian cows in a pasture-based, seasonal-calving dairy system. Journal of Dairy Science 96, 5352–5363.
Production and reproduction of Fleckvieh, Brown Swiss, and 2 strains of Holstein-Friesian cows in a pasture-based, seasonal-calving dairy system.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3sXpsFSgt7o%3D&md5=9dd0168a7004403c2c9acd51adcd1165CAS |

Pratt C, Walcroft AS, Tate KR, Ross DJ, Roy R, Reid MH, Veiga PW (2012) Biofiltration of methane emissions from a dairy farm effluent pond. Agriculture, Ecosystems & Environment 152, 33–39.
Biofiltration of methane emissions from a dairy farm effluent pond.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC38XkvFSns7g%3D&md5=8a69b9552da80fc063e579fa5c2aa494CAS |

Pratt C, Deslippe J, Tate KR (2013) Testing a biofilter cover design to mitigate dairy effluent pond methane emissions. Environmental Science & Technology 47, 526–532.
Testing a biofilter cover design to mitigate dairy effluent pond methane emissions.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC38XhslKhs7rO&md5=f2a12a6dbf1b76a34075b0cefda45d61CAS |

Rahman S, Borhan MS, Swanson K (2013) Greenhouse gas emissions from beef cattle pen surfaces in North Dakota. Environmental Technology 34, 1239–1246.
Greenhouse gas emissions from beef cattle pen surfaces in North Dakota.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC38XhsF2hsb7L&md5=5007285295ecbe5e3d39f187ba8d659cCAS |

Redding MR (2011) Bentonites and layered double hydroxides can decrease nutrient losses from spent poultry litter. Applied Clay Science 52, 20–26.
Bentonites and layered double hydroxides can decrease nutrient losses from spent poultry litter.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3MXjvVegtb8%3D&md5=11df008a87a5dcaec4cc563516f61790CAS |

Redding MR, Lewis RJ, Waller J, Phillips F, Griffith D Large-chamber methane and nitrous oxide measurements are comparable to the backward Lagrangian stochastic method. Journal of Environmental Quality in press.

Robertson AP, Hoxey RP, Demmers TGM, Welch SK, Sneath RW, Stacey KF, Fothergill A, Filmer D, Fisher C (2002) Commercial-scale studies of the effect of broiler-protein intake on aerial pollutant emissions. Biosystems Engineering 82, 217–225.
Commercial-scale studies of the effect of broiler-protein intake on aerial pollutant emissions.Crossref | GoogleScholarGoogle Scholar |

Rochette P, Eriksen-Hamel NS (2008) Chamber measurements of soil nitrous oxide flux: are absolute values reliable? Soil Science Society of America Journal 72, 331–342.
Chamber measurements of soil nitrous oxide flux: are absolute values reliable?Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD1cXjsFynsLw%3D&md5=ae7c2abf72817a637518f08a787657d2CAS |

Rotz CA (2004) Management to reduce nitrogen losses in animal production. Journal of Animal Science 82, E119–E137.

Saggar S, Bolan NS, Bhandral R, Hedley CB, Luo J (2004) A review of emissions of methane, ammonia, and nitrous oxide from animal excreta deposition and farm effluent application in grazed pastures. New Zealand Journal of Agricultural Research 47, 513–544.
A review of emissions of methane, ammonia, and nitrous oxide from animal excreta deposition and farm effluent application in grazed pastures.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD2MXhvFyltbg%3D&md5=b66b66742fadd1598e940e8e3fd9288aCAS |

Shilton AN, Guieysse B, Pratt C, Walcroft A (2009) GHG abatement: the new paradigm for wastewater management in the agricultural industry – economic evaluation of options for a typical New Zealand dairy farm. In ‘IWA Chemical Industries Specialist Group Conference’. (Water and Industry: Palmerston North, New Zealand)

Stehfest E, Bouwman L (2006) N2O and NO emission from agricultural fields and soils under natural vegetation: summarizing available measurement data and modeling of global annual emissions Nutrient Cycling in Agroecosystems 74, 207–228.

Varel VH, Nienaber JA, Freetly HC (1999) Conservation of nitrogen in cattle feedlot waste with urease inhibitors. Journal of Animal Science 77, 1162–1168.

Wilkinson KG (2011) A comparison of the drivers influencing adoption of on-farm anaerobic digestion in Germany and Australia. Biomass and Bioenergy 35, 1613–1622.
A comparison of the drivers influencing adoption of on-farm anaerobic digestion in Germany and Australia.Crossref | GoogleScholarGoogle Scholar |

Williams DJ (1993) Methane emissions from manure of free-range dairy cows. Chemosphere 26, 179–187.
Methane emissions from manure of free-range dairy cows.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DyaK3sXitFylu7k%3D&md5=19a5bb1d0cf90a66876a313f80c96d71CAS |