|
Margot Berger - Vol. 18 Num. 2 (1998) |
| Graphic calculators: an interpretive framework                          
| 13-20 |
Margot Berger - Vol. 24 Num. 2 (2004) |
| Heaps, complexes and concepts (part I)                          
| 2-6 |
Margot Berger - Vol. 24 Num. 3 (2004) |
| Heaps, complexes and concepts (part 2)                          
| 11-17 |