classic papers of the week -- 210

Cosmological limits to the number of massive leptons

• G. Steigman (National Radio Astronomy Observatory; Yale University) , D.N. Schramm, J.E. Gunn (University of Chicago, California Institute of Technology)

The four laws of black hole mechanics

• Bardeen, J. M. (Department of Physics, Yale University); Carter, B.; Hawking, S. W. (Institute of Astronomy, University of Cambridge)

The Pressure due to Radiation

• Nichols, E. F.; Hull, G. F. (Wilder Laboratory, Dartmouth College)