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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 21, No. 3, pp. 511–516, September, 1974.
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Makhanek, A.G., Korol'kov, V.S. & Fedorov, A.F. The application of analytical methods in degenerate perturbation theory. J Appl Spectrosc 21, 1229–1233 (1974). https://doi.org/10.1007/BF00625851
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DOI: https://doi.org/10.1007/BF00625851