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1.
Operated with support from the U.S. Air Force.
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Supplied by Walter Hargraves of Opto‐Vac Company.
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P. P. Sorokin and M. J. Stevenson, Advances in Quantum Electronics, ed J. R. Singer (Columbia University Press, New York, 1961), pp 65–76.
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© 1964 American Institute of Physics.
1964
American Institute of Physics
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