Revealing the structure of the lensed quasar Q 0957+561: I. Accretion disk size

1. Fian, C.
2. Mediavilla, E.
3. Jiménez-Vicente, J.
4. Motta, V.
5. Muñoz, J.A.
6. Chelouche, D.
7. Goméz-Alvarez, P.
8. Rojas, K.
9. Hanslmeier, A.