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Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 1, No. 3, pp. 360–374, December, 1969.
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Perelomov, A.M., Popov, V.S. Group-theoretical aspects of the variable frequency oscillator problem. Theor Math Phys 1, 275–285 (1969). https://doi.org/10.1007/BF01035742
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DOI: https://doi.org/10.1007/BF01035742