Different evolutionary stages in the massive star-forming region S255 complex Y. Wang, H. Beuther, A. Bik, T. Vasyunina, Z. Jiang, E. Puga, H. Linz, J. A. Rodón, Th. Henning and M. Tamura A&A, 527 (2011) A32 Published online: 21 January 2011 DOI: 10.1051/0004-6361/201015543