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J. M. Cork*, W. C. Rutledge*, A. E. Stoddard*, C. E. Branyan*, and W. J. Childs*
Phys. Rev. 81, 482 – Published 1 February, 1951
DOI: https://doi.org/10.1103/PhysRev.81.482.2
© 1951 American Physical Society