Linear polarization measurements of extragalactic radio sources at λ6.3 cmE. L.H. Zukowski, P. P. Kronberg, T. Forkert and R. WielebinskiAstron. Astrophys. Suppl. Ser., 135 3 (1999) 571-577DOI: https://doi.org/10.1051/aas:1999190