1. The Open University, Open University On-Line Courses HomePage, 1997: http://cszx.open.ac.uk/
2. Infoseek On Line Education Library resources, 1997: http://www.integralink.com/olel/
3. Teaching and Learning Online, University of Minnesota Teaching Services, 1997: http://www.mes.umn.edu/∼hoefer/coursdev/teachlrn.htm
4. University of Geneva, TECFA, Technologies de Formation et Apprentissage (Training Technologies and Learning), 1997: http://tecfa.unige.ch/
5. Adaptive finite element mesh refinement- a CAL module on the world wide web;Isreb;Comput. Struct. J.,1997