classic papers of the week -- 86

A Relativistic Equation for Bound-State Problems

• Salpeter, E. E.; Bethe, H. A. (Newman Laboratory of Nuclear Studies, Cornell University, Ithaca, New York)

See also

On the Masses of Nebulae and of Clusters of Nebulae

• Zwicky, F.

Interaction between Four Half-Spin Particles and the Decay of the μ-Meson

• Michel, L. (Physics Department, University of Manchester)