Michael A. D'Eredita Michael Sanford Nilan Conceptualizing Virtual Collaborative Work. 21-34 2007 conf/ifip8-2/2007 Virtuality and Virtualization http://dx.doi.org/10.1007/978-0-387-73025-7_4 db/conf/ifip8-2/ifip8-2-2007.html#DEreditaN07