Non-iterative methods to estimate the in-flight noise properties of CMB detectors P. Natoli, D. Marinucci, P. Cabella, G. de Gasperis and N. Vittorio A&A, 383 3 (2002) 1100-1112 Published online: 15 March 2002 DOI: 10.1051/0004-6361:20011788