| Joel Hillel - Vol. 5 Num. 2 (1985) | ||
| On logo squares, triangles and houses | 38-45 | |
| Joel Hillel - Vol. 6 Num. 3 (1986) | ||
| Un château en Espagne | 24-26 | |
| Joel Hillel - Vol. 16 Num. 3 (1996) | ||
| The 8th International Congress of Mathematical Education, July 1996: Impressions of ICME 8 | 22-24 | |
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