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Regeneration and Mass Difference of Neutral <i>K</i> Mesons
Francis Muller, Robert W. Birge, William B. Fowler, Robert H. Good, Warner Hirsch, Robert P. Matsen, Larry Oswald, Wilson M. Powell, Howard S. White, and Oreste Piccioni
Phys. Rev. Lett. 4, 539 (1960)

Recoilless Rayleigh Scattering in Solids
C. Tzara and R. Barloutaud
Phys. Rev. Lett. 4, 539 (1960)