El-Tech: A Performance Support System with Embedded Training for Electronics Technicians. - Alberto J. Cañas; John Coffey 001; Thomas Reichherzer; Greg Hill; Niranjan Suri; Roger Carff; Timothy S. Mitrovich; Derek Eberle (FLAIRS, 1998)

Knowledge modeling and the creation of El-Tech: a performance support and training system for electronic technicians. - John W. Coffey; Alberto J. Cañas; Greg Hill; Roger Carff; Thomas Reichherzer; Niranjan Suri (Expert Syst. Appl., 2003)

Concept Maps: Integrating Knowledge and Information Visualization. - Alberto J. Cañas; Roger Carff; Greg Hill; Marco M. Carvalho; Marco Arguedas; Thomas C. Eskridge; James Lott; Rodrigo Carvajal (Knowledge and Information Visualization, 2005)