DOI:https://doi.org/10.1103/PhysRevLett.20.1265
©1968 American Physical Society
Irwin I. Shapiro*, Gordon H. Pettengill, Michael E. Ash, Melvin L. Stone, William B. Smith, Richard P. Ingalls, and Richard A. Brockelman†
Vol. 20, Iss. 22 — 27 May 1968
Sign up to receive regular email alerts from Physical Review Letters