| 其他書名 | Colloquium Held at July 3 and 4 1959, at the Royal Observatory at Uccle, Belgium, Under the Auspice of Subcommission 29 a of the International Astronomical Union |
| 出版 | Ceuterick, 1959 |
| URL | http://books.google.com.hk/books?id=KQVP-GCtPGYC&hl=&source=gbs_api |