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Agyei, D. & Voogt, J. (2012). Pre-Service Mathematics Teachers’ Learning and Teaching of Activity-Based Lessons Supported with Spreadsheets. In P. Resta (Ed.), Proceedings of SITE 2012--Society for Information Technology & Teacher Education International Conference (pp. 4322-4329). Austin, Texas, USA: Association for the Advancement of Computing in Education (AACE).