| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Geometry in Egyptian Art | 978-82-09-10441-5 (82-09-10441-1) | 1987 |
| Geometry in Greek art: Studied in the light of Egyptian methods | 978-82-09-01873-6 (82-09-01873-6) | 1984 |
| Stave churches and Viking ships: Studied in the light of Egyptian-Greek methods | 978-82-09-01872-9 (82-09-01872-8) | 1981 |