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* "''[https://web.archive.org/web/20100831022236/http://www.tat.physik.uni-tuebingen.de/~frutto/ XFGLenses]''". A Computer Program to visualize Gravitational Lenses, Francisco Frutos-Alfaro
* "''[https://web.archive.org/web/20070929124804/http://www.btinternet.com/~Boughen/G-LenS G-LenS]''". A Point Mass Gravitational Lens Simulation, Mark Boughen.
* Newbury, Pete, "''[httphttps://wwwweb.iamarchive.ubc.caorg/old_pagesweb/newbury20110523100723/lenses/lenses.html Gravitational Lensing]{{깨진 링크|url=http://www.iam.ubc.ca/old_pages/newbury/lenses/lenses.html }}Gravitational Lensing]''". Institute of Applied Mathematics, The University of British Columbia.
* Cohen, N., "Gravity's Lens: Views of the New Cosmology", Wiley and Sons, 1988.
* "''[http://cfa-www.harvard.edu/~rschild/qgl.html Q0957+561 Gravitational Lens]''". Harvard.edu.