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astro-ph2001★ 65 cited
The Gravitational Lens -- Galaxy Group Connection: I. Discovery of a Group Coincident with CLASS B0712+472
C. D. Fassnacht, L. M. Lubin
Previous observations of the environments of the lensing galaxies in gravitational lens systems suggest that many of the lensing galaxies are associated with small groups of galaxi…
astro-ph1999★ 58 cited
A Keck Survey of Gravitational Lens Systems: I. Spectroscopy of SBS 0909+532, HST 1411+5211, and CLASS B2319+051
L. M. Lubin, C. D. Fassnacht, A. C. S. Readhead +2
We present new results from a continuing Keck program to study gravitational lens systems. We have obtained redshifts for three lens systems, SBS 0909+532, HST 1411+5211, and CLASS…