
%0 Journal Article
%A Roberts, JA 
%A Roger, RS 
%A Ribes, J-C 
%A Cooke, DJ 
%A Murray, JD 
%A Cooper, BFC 
%A Biraud, F 
%T Measurements of the Circular Polarization of Radio Sources at Frequencies of 0·63, 1·4, 5·0 and 8·9 GHz
%J Australian Journal of Physics
%D 1975/06/01
%V 28
%N 3
%P 325-352
%K 
%R https://doi.org/10.1071/PH750325
%U https://www.publish.csiro.au/paper/PH750325 
%X Circular polarization measurements were made with the Parkes 64 m telescope on 66 mainly extragalactic sources, 33 of which were studied at two or more frequencies. Circular polarization was definitely found in the eight quasi-stellar sources PKS0237-23, 0537-441, 1127-14, 1226+02 (3C273), 1253-05 (3C279), 2134+004, 2145+06 and 2345-16, as it was measured at the 4u level or higher in at least two observing sessions. 
