3
by Yager, W. A., Merritt, F. R.
Published in Physical Review (1949)
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5
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7
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8
by Townes, C. H., Merritt, F. R.
Published in Physical Review (1947)
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9
by Townes, C. H., Merritt, F. R.
Published in Physical Review (1946)
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11
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