Beam mismatch effects in cosmic microwave background polarization measurements C. Rosset, V. B. Yurchenko, J. Delabrouille, J. Kaplan, Y. Giraud-Héraud, J.-M. Lamarre and J. A. Murphy A&A, 464 1 (2007) 405-415 Published online: 11 December 2006 DOI: 10.1051/0004-6361:20042230