@ARTICLE{MerzGriffelTuMüller-WilkenWeinreichBogerLamersdorf1998, author = {Michael Merz and Frank Griffel and Tuan Tu and Stefan Müller-Wilken and Harald Weinreich and Marko Boger and Winfried Lamersdorf}, title = {Supporting Electronic Commerce Transactions with Contracting Services}, journal = {International Journal on Cooperative Information Systems, Vol. 7, No. 4}, year = {1998} }