Tolong jelaskan mengenai Paper dan rujukan historis dari Lensa gravitasi

"Accidental Astrophysicists ". Science News, June 13, 2008.

"XFGLenses ". A Computer Program to visualize Gravitational Lenses, Francisco Frutos-Alfaro

"G-LenS". A Point Mass Gravitational Lens Simulation, Mark Boughen.

Newbury, Pete, "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.

Bridges, Andrew, "Most distant known object in universe discovered". Associated Press. February 15, 2004. (Farthest galaxy found by gravitational lensing, using Abell 2218 and Hubble Space Telescope.)

Analyzing Corporations ... and the Cosmos  An unusual career path in gravitational lensing.

"HST images of strong gravitational lenses". Harvard-Smithsonian Center for Astrophysics.

"A planetary microlensing event" and "A Jovian-mass Planet in Microlensing Event OGLE-2005-BLG-071", the first extra-solar planet detections using microlensing.