classic papers of the week -- 169

Self-Consistent Equations Including Exchange and Correlation Effects

• Kohn, W.; Sham, L. J. (University of California, San Diego, La Jolla, CA)

Testing Relativity with Laser Ranging to the Moon

• Nordtvedt, K. (Department of Physics, Montana State University, Bozeman, MT)

Extraterrestrial Cause for the Cretaceous-Tertiary Extinction

• Alvarez, Luis W.; Alvarez, Walter; Asaro, Frank; Michel, Helen V.