| Michael de Villiers - Vol. 14 Num. 1 (1994) | ||
| The role and function of a hierarchical classification of quadrilaterals | 11-18 | |
for the learning of mathematics
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| Michael de Villiers - Vol. 14 Num. 1 (1994) | ||
| The role and function of a hierarchical classification of quadrilaterals | 11-18 | |