Polarimetry of evolved stars - III. RV Tau and R CrB stars R. V. Yudin, A. Evans, P. Barrett, J. S. Albinson, J. K. Davies and M. G. Hutchinson A&A, 412 2 (2003) 405-416 Published online: 28 November 2003 DOI: 10.1051/0004-6361:20031271