Dynamic star formation in the massive DR21 filament N. Schneider, T. Csengeri, S. Bontemps, F. Motte, R. Simon, P. Hennebelle, C. Federrath and R. Klessen A&A, 520 (2010) A49 Published online: 30 September 2010 DOI: 10.1051/0004-6361/201014481