New two-colour light curves of Q0957+561: Time delays and the origin of intrinsic variations
- Shalyapin, V.N.
- Goicoechea, L.J.
- Koptelova, E.
- Ullán, A.
- Gil-Merino, R.
ISSN: 0004-6361, 1432-0746
Année de publication: 2008
Volumen: 492
Número: 2
Pages: 401-410
Type: Article