| Kazuhiko Nunokawa - Vol. 14 Num. 1 (1994) | ||
| Improving diagrams gradually: one approach to using diagrams in problem solving | 34-38 | |
| Kazuhiko Nunokawa - Vol. 21 Num. 3 (2001) | ||
| Surprises in mathematics lessons | 43-50 | |
for the learning of mathematics
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