Bettina Törpel Volkmar Pipek Markus Rittenbruch Creating Heterogeneity - Evolving Use of Groupware in a Network of Freelancers. 381-409 2003 12 Computer Supported Cooperative Work 4 http://dx.doi.org/10.1023/A:1026192900770 db/journals/cscw/cscw12.html#TorpelPR03