A 1956 paper with Professor Ken Lande as first author is the first reference for meson-antimeson oscillations in a just-published paper on D0-D0-bar oscillations. These oscillations are intimately related to the existence of three generations of quarks. The first observation of K0-K0-bar oscillations by K. Lande, E. Booth, J. Impeduglia, L. Lederman, and W. Chinowsky paved the way for a half-century of study of oscillations that has culminated with the observation of oscillations of mesons involving the charm quark.
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