Ground-state ammonia and water in absorption towards Sgr B2
E. S. Wirström, P. Bergman, J. H. Black, Å. Hjalmarson, B. Larsson, A. O. H. Olofsson, P. J. Encrenaz, E. Falgarone, U. Frisk, M. Olberg and Aa. Sandqvist
A&A, 522 (2010) A19
DOI: https://doi.org/10.1051/0004-6361/200913766