| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Disordered Systems and New Materials: Proceedings of the Fifth International School on Condensed Matter Physics, Varna, Bulgaria 19-27 September 198 | 978-9971-5-O79O-9 (9971-5-O79O-O) | 1989 | N. Kirov · Milko Borisov · Aleksandur Vavrek |
Bulgaria) International School on Microwave Physics and Technique (5th : 1987 : Varna