https://www.osti.gov/pages/biblio/1617052-search-gravitationally-lensed-quasars-quasar-pairs-pan-starrs1-spectroscopy-sources-shear-diamond
The U.S. Department of Energy's Office of Scientific and Technical Information
searchgravitationallyquasarspairs
https://www.sciencedaily.com/releases/2008/02/080219155653.htm
Astronomers have compiled a large catalogue of gravitational lenses in the distant universe. The catalogue contains a staggering 67 new gravitationally lensed...
distant universedozensgravitationallygalaxiesdiscovered