A Customizable Collaborative Virtual Environment on the Web. - Roberto C. Portugal; Luis A. Guerrero; David A. Fuller 001 (SPIRE/CRIWG, 1999)

TOP: A Platform for the Development of Web Interfaces and Collaborative Applications. - Luis A. Guerrero; Roberto C. Portugal; David A. Fuller 001 (CLEI Electron. J., 1999)

DeskTOP, a system based on virtual spaces to support and to promote collaborative learning (poster session). - Roberto C. Portugal; Luis A. Guerrero; David A. Fuller 001 (CVE, 2000)