Gravitational Lens Data Base
- http://www.cfa.harvard.edu/castles/
- Homepage of CASTLEs, a gravitational lensing survey based at the Harvard-Smithsonian Center for Astrophysics. The main feature is a data base, complete with images, of all gravitational lens candidates that astronomers have identified so far.
Lectures on Gravitational Lensing
- http://arxiv.org/abs/astro-ph/9606001
- Lecture notes by Ramesh Narayan (Harvard-Smithsonian Center for Astrophysics) and Matthias Bartelmann (Max Planck Institute for Astronomy) about the basic concepts and applications of gravitational lensing.
Lens an Astrophysicist!
- http://theory2.phys.cwru.edu/~pete/GravitationalLens/
- Interactive Java applet by Pete Kernan (Case Western Reserve University) that allows the visitor to take any of a number of images of astrophysicists, or specify an image by its URL, and explore how it would be distorted by different kinds of gravitational lensing effect.
Weak Gravitational Lensing
- http://arxiv.org/abs/astro-ph/9912508
- Article by Matthias Bartelmann and Peter Schneider about the statistical analysis of weak lensing effects that can be used to gain information about the large-scale mass distribution within our Universe.