| William M. Brookes - Vol. 4 Num. 3 (1984) | ||
| Communication: Research problems in mathematics education - III f | 28-29 | |
| William M. Brookes - Vol. 6 Num. 1 (1986) | ||
| Two comments on Didactical Phenomenology 2 | 26 | |
for the learning of mathematics
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