Comparative study of complex N- and O-bearing molecules in hot molecular cores F. Fontani, I. Pascucci, P. Caselli, F. Wyrowski, R. Cesaroni and C. M. Walmsley A&A, 470 2 (2007) 639-652 Published online: 25 May 2007 DOI: 10.1051/0004-6361:20077485