Zhaomin Ren Tarek M. Hassan Chimay J. Anumba Godfried Augenbroe Mauro Mangini Electronic Contracting in the E-Engineering Hub. 235-244 2004 conf/ifip5-5/2004 Virtual Enterprises and Collaborative Networks db/conf/ifip5-5/ifip5-5-2004.html#RenHAAM04