| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Natural Language and Logic: International Scientific Symposium, Hamburg, Frg, May 9-11, 1989 Proceedings | 978-O-387-53O82-6 (O-387-53O82-7) | 1991 |
Germany) International Symposium Geodesy and Physics of the Earth (2nd : 1973 : Potsdam