A.-K. Jappsen (1 and 2), S. C. O. Glover (2 and 3), R. S. Klessen (4 and 2), M.-M. Mac Low (3 and 4) ((1) Canadian Institute for Theoretical Astrophysics, Toronto, Canada, (2) Astrophysikalisches Institut Potsdam, Potsdam, Germany, (3) Department of Astrophysics, American Museum of Natural History, New York, USA, (4) Zentrum für Astronomie der Universität Heidelberg, Institut für Theoretische Astrophysik, Heidelberg, Germany)
