DOI:https://doi.org/10.1103/PhysRevLett.14.298
©1965 American Physical Society
A. Bardasis, D. S. Falk, R. A. Ferrell, M. S. Fullenbaum, and R. E. Prange
D. L. Mills
Vol. 14, Iss. 9 — 1 March 1965
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