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New two-colour light curves of Q0957+561: time delays and the origin of intrinsic variations

V. N. Shalyapin, L. J. Goicoechea, E. Koptelova, A. Ullán and R. Gil-Merino
Astronomy & Astrophysics 492 (2) 401 (2008)
DOI: 10.1051/0004-6361:200810447
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