| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Vacantiecursus 1983 complexe getallen | 978-90-6196-328-8 (90-6196-328-1) | 1987 |
| Vacantiecursus 1986: matrices | 978-90-6196-304-2 (90-6196-304-4) | 1986 |
| Vacantiecursus 1987: de personal computer en de wiskunde op school | 978-90-6196-323-3 (90-6196-323-0) | 1987 |