David Romero Nathalíe Galeano Arturo Molina A Conceptual Model For Virtual Breeding Environments Value Systems. 43-52 2007 conf/ifip5-5/2007 Virtual Enterprises and Collaborative Networks http://dx.doi.org/10.1007/978-0-387-73798-0_5 db/conf/ifip5-5/ifip5-5-2007.html#RomeroGM07