Institution: | 1. Department of Mathematical Sciences, University of Delaware, 523 Ewing Hall, 19716, Newark, De, USA 2. Dept. of Math Education, Korea National University of Education, Cheongwon, 363-791, Chungbuk, Korea 3. School of Education, University of Delaware, 19716, Newark, De, USA 4. Dept. of Mathematics, Statistics and Computer Science, Marquette University, P.O. Box 1881, 53201-1881, Milwaukee, WI 5. Mathematics and Mathematics Education Academic Group, National Institute of Education, 1 Nanyang Walk, 637 616, Singapore 6. School of Education and Human Development, SUNY At Binghamton, P. O. Box 6000, Binghamton, NY, 13902-6000
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