Elka Todeva · R. Todev · Titov
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Algebra problems and solutions from Mathematical Olympiads | 978-0-9827713-1-0 (0-9827713-1-2) | 2010 |
| Geometry problems and solutions from Mathematical Olympiads | 978-0-9827713-2-7 (0-9827713-2-0) | 2010 |