Pure Appl. Chem., 1965, Vol. 11, No. 3-4, pp. 311-324
http://dx.doi.org/10.1351/pac196511030311
Molecular spectroscopy with optical masers
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Pure Appl. Chem., 1965, Vol. 11, No. 3-4, pp. 311-324
http://dx.doi.org/10.1351/pac196511030311