| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| 6th International School on Physical Problems in Microelectronics: 23-28 May 1989: Varna, Bulgaria | 978-9971-5-0976-7 (9971-5-0976-8) | 1989 |
| 6th International School on Physical Problems in Microelectronics | 978-9971-5-0380-2 (9971-5-0380-8) | 1989 |
| Physical problems in microelectronics: Proceedings of the Fourth International School, ISPPME '85, Varna, Bulgaria, 12-18 May 1985 | 978-9971-5-0017-7 (9971-5-0017-5) | 1985 |