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Gadanidis, G. & Schindler, K. (2004). Factors Affecting Pre-service Mathematics Teachers’ Lesson Planning with Learning Objects Supporting Higher Level Thinking. In R. Ferdig, C. Crawford, R. Carlsen, N. Davis, J. Price, R. Weber & D. Willis (Eds.), Proceedings of SITE 2004--Society for Information Technology & Teacher Education International Conference (pp. 4432-4437). Atlanta, GA, USA: Association for the Advancement of Computing in Education (AACE).