QSO optical counts and constraints on the X-ray background
- Author(s):
- Publication title:
- Proceedings of the 23rd ESLAB Symposium on two topics in X-ray astronomy, Bologna, Italy, 13-20 September 1989
- Title of ser.:
- ESA SP
- Ser. no.:
- 296
- Pub. Year:
- 1989
- Page(from):
- 909
- Page(to):
- 914
- Pages:
- 6
- Pub. info.:
- Noordwijk: ESA Publications Division
- ISSN:
- 03796566
- ISBN:
- 9789290920267 [9290920262]
- Language:
- English
- Call no.:
- E11690/900861
- Type:
- Conference Proceedings
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