1. http://www.cvc.org/science/kepler.htm
2. Todd Haines
Physics Division, P-23
MS H803
Los Alamos National Laboratory of the
University of California
(505)667-3638
3. "Scientific American" aricles from January 1996 to October 1998
4. http://www.cvc.org/physics/gamma.htm
5. http://www.astro.nwu.edu/astro/purcell/511kev/megraw.html