261 citations · 1.3k across the 41 of their papers we have counts for
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astro-ph1999★ 38 cited
BVRI photometry of QSO 0957+561A, B: Observations, new reduction method and time delay
M. Serra-Ricart, A. Oscoz, T. Sanchis +5
CCD observations of the gravitational lens system Q0957+561A,B in the BVRI bands are presented in this paper. The observations, taken with the 82 cm IAC-80 telescope, at Teide Obse…
astro-ph1999★ 5 cited
Spectroscopy of the Lens Galaxy of Q0957+561A,B. Implications of a possible central massive dark object
E. Mediavilla, M. Serra-Ricart, A. Oscoz +2
We present new long-slit William Herschel Telescope spectroscopic observations of the lens galaxy G1 associated with the double-imaged QSO 0957+561A,B. The obtained central stellar…