Document Type

Article

Publication Date

6-12-1967

Comments

©1967 American Physical Society

The following article appeared in Phys. Rev. Letters. 18, 1039 (1967); https://doi.org/10.1103/PhysRevLett.18.1039 and may be found at http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.18.1039

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