| title | ISBN-13 (ISBN-10) | year of publication | |
|---|---|---|---|
| Stars and the Milky Way System: Volume 2 Proceedings of the First European Astronomical Meeting Athens, September 4-9, 1972 | 978-3-540-06383-4 (3-540-06383-8) | 1974 | |
| Structure & Evolution of the Galexy Proc | 978-0-387-91072-7 (0-387-91072-7) | 1971 |