A study of three southern high-mass star-forming regions C. Dedes, S. Leurini, F. Wyrowski, P. Schilke, K. M. Menten, S. Thorwirth and J. Ott A&A, 526 (2011) A59 Published online: 21 December 2010 DOI: 10.1051/0004-6361/200912874