M. Bischof, O. Kopp, T. van Lessen, and F. Leymann. 2009 35th Euromicro Conference on Software Engineering and Advanced Applications (SEAA 2009), page 39--46. IEEE Computer Society Press, (August 2009)
O. Kopp, L. Engler, T. van Lessen, F. Leymann, and J. Nitzsche. Subject-Orientation as Enabler for the Next Generation of BPM Tools and Methods - Second International Conference S-BPM ONE 2010, volume 138 of Communications in Computer and Information Science, page 36--53. Springer, (January 2011)