Gas-phase CO depletion and N2H+ abundances in starless cores N. Lippok, R. Launhardt, D. Semenov, A. M. Stutz, Z. Balog, Th. Henning, O. Krause, H. Linz, M. Nielbock, Ya. N. Pavlyuchenkov et al. (3 more) A&A, 560 (2013) A41 Published online: 02 December 2013 DOI: 10.1051/0004-6361/201322129