Information Technology in B2B E-procurement: Open vs. Proprietary Systems. - Robert J. Kauffman; Hamid Mohtadi (HICSS, 2002)

Proprietary and Open Systems Adoption in E-Procurement: A Risk-Augmented Transaction Cost Perspective. - Robert J. Kauffman; Hamid Mohtadi (J. Manag. Inf. Syst., 2004)