H2O emission in high-z ultra-luminous infrared galaxies A. Omont, C. Yang, P. Cox, R. Neri, A. Beelen, R. S. Bussmann, R. Gavazzi, P. van der Werf, D. Riechers, D. Downes et al. (40 more) A&A, 551 (2013) A115 Published online: 05 March 2013 DOI: 10.1051/0004-6361/201220811