Birgit Hofreiter Christian Huemer Philipp Liegl Rainer Schuster Marco Zapletal UN/CEFACT'S Modeling Methodology (UMM): A UML Profile for B2B e-Commerce. 19-31 2006 conf/er/2006w ER (Workshops) http://dx.doi.org/10.1007/11908883_5 db/conf/er/erw2006.html#HofreiterHLSZ06