| |
| 1986 | ||
|---|---|---|
| 1 | Gerrit C. van der Veer, John van Beek, Guus A. N. Cruts: Learning structured diagrams - effect of mathematical background, instruction and problem semantics. Informatics and Psychology Workshop 1986: 70-88 | |
| 1 | Guus A. N. Cruts | [1] |
| 2 | Gerrit C. van der Veer | [1] |