The nature of pulsar radiation

Nature. 1970 May 16;226(5246):622-4. doi: 10.1038/226622a0.

Abstract

Pulsar radiation may be due to particles which gyrate while moving in bunches along curved orbits. If emitted by electrons, the pulses should come from near the speed of light circle; if emitted by protons, they should arise within a few stellar radii of the underlying star.