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Callahan, P. (2003): Development of an Instructional Training Model and Diagnostics in Support of e-Learning. In: Stephanidis, Constantine (eds.) Proceedings of the Tenth International Conference on Human-Computer Interaction June 22-27, 2003, Crete, Greece. pp. 901-905.
Callahan, P. (2001): Diagnostic Methods in Distance Education and Non-Traditional Learning Environments. In: Proceedings of the Ninth International Conference on Human-Computer Interaction , 2001, . pp. 697-700.