Institution: | 1. School of Education, Sugiyama Jogakuen University, 17-3 Hoshigaoka-motomachi, Chikusa-ku, Nagoya, 464-8662 Japan;2. 16, rue Philippe, 68 200 Hégenheim – France;3. Simion Stoilow Institute of Mathematics of the Romanian Academy, P.O. Box 1-764, 014700 Bucharest, Romania |