| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Fourth meeting of the Space Agency Forum on the International Space Year, : Moscow, USSR May 16-17, 1991 | 978-92-9092-140-0 (92-9092-140-4) | 1991 |
| Second Meeting of the Space Agency Forum on the International Space Year : Esrin, Frascati, Italy, 2-3 May 1989 | 978-92-9092-032-8 (92-9092-032-7) | 1990 |