Herschel discovery of a new class of cold, faint debris discs C. Eiroa, J. P. Marshall, A. Mora, A. V. Krivov, B. Montesinos, O. Absil, D. Ardila, M. Arévalo, J.-Ch. Augereau, A. Bayo et al. (18 more) A&A, 536 (2011) L4 Published online: 06 December 2011 DOI: 10.1051/0004-6361/201117797