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19992026
most citedThe nature and size of the optical continuum source in QSO 2237+0305

64 citations · 539 across the 29 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…