| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) | |
|---|---|---|---|---|
| Unsolved Problems in Geometry | 978-3-540-97506-9 (3-540-97506-3) | 1994 | Kenneth J. Falconer · Richard K. Guy | |
| Unsolved Problems in Geometry: Unsolved Problems in Intuitive Mathematics | 978-0-387-97506-1 (0-387-97506-3) | 1994 | Kenneth Falconer · Richard K. Guy |