Time Delay of Q0957+561A,B from the IAC's 1996-99 Data Oscoz, A. ; Serra-Ricart, M. ; Alcalde, D. ; Mediavilla, E. ; Motta, V. ; Licandro, J. ; Goicoechea, L. J. Abstract Publication: Gravitational Lensing: Recent Progress and Future Go Pub Date: January 2001 Bibcode: 2001ASPC..237..153O