O. Kopp, R. Mietzner, and F. Leymann. CoopIS 2009 (OTM 2009), volume 5870 of Lecture Notes in Computer Science, page 381--388. Berlin, Heidelberg, Springer-Verlag, (November 2009)
O. Kopp, B. Wetzstein, R. Mietzner, S. Pottinger, D. Karastoyanova, and F. Leymann. 1st International Workshop on Model-Driven Engineering for Business Process Management (MDE4BPM 2008), volume 17 of Lecture Notes in Business Information Processing, page 188--199. Springer-Verlag, (September 2008)