Polarization measurement analysis - I. Impact of the full covariance matrix on polarization fraction and angle measurementsL. Montier, S. Plaszczynski, F. Levrier, M. Tristram, D. Alina, I. Ristorcelli and J.-P. BernardA&A, 574 (2015) A135DOI: https://doi.org/10.1051/0004-6361/201322271