机译:He 1113-0641: The smallest-separation quadruple lens identified by a ground-based optical telescope
MIT, Dept Phys, Cambridge, MA 02139 USA;
Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA;
Inst Astrophys, D-14482 Potsdam, Germany;
gravitational lensing; quasars : individual (HE 1113-0641); GALAXIES; QUASAR; SAMPLE;