Planck pre-launch status: High Frequency Instrument polarization calibration C. Rosset, M. Tristram, N. Ponthieu, P. Ade, J. Aumont, A. Catalano, L. Conversi, F. Couchot, B. P. Crill, F.-X. Désert et al. (28 more) A&A, 520 (2010) A13 Published online: 15 September 2010 DOI: 10.1051/0004-6361/200913054