@phdthesis{TUW-140168, author = {Kramler, Gerhard}, title = {Model Driven Development of Inter-organizational Workflows}, school = {Institut f{\"u}r Softwaretechnik und Interaktive Systeme}, year = {2004}, url = {http://www.big.tuwien.ac.at/research/publications/phdtheses/kramler.pdf} }