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R. Masoon, and J. Macfeetors. proceedings of 2002 annual meeting of the Canadian Mathematics Education Study Group, page 143--144. Queen's University, (May 2002)
M. Mosimege. Proceedings of the 22nd Conference of the International Group for the Psychology of Mathematics Education, 3, page 279--286. Stellenbosch, South Africa, PME, University of Stellenbosch, (July 1998)
M. Mariotti. Proceedings of the 22nd Conference of the International Group for the Psychology of Mathematics Education, 1, page 180--195. Stellenbosch, South Africa, PME, University of Stellenbosch, (July 1998)