The cooling of atomic and molecular gas in DR21 H. Jakob, C. Kramer, R. Simon, N. Schneider, V. Ossenkopf, S. Bontemps, U. U. Graf and J. Stutzki A&A, 461 3 (2007) 999-1012 Published online: 16 October 2006 DOI: 10.1051/0004-6361:20065855