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Additional information
Joint Institute for Nuclear Research, Dubna. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 62, No. 2, pp. 304–311, February, 1985.
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Gorshkov, S.N., Zabrodin, A.V., Rodriguez, C. et al. Feynman's variational principle for a polaron in a magnetic field. Theor Math Phys 62, 205–210 (1985). https://doi.org/10.1007/BF01033531
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DOI: https://doi.org/10.1007/BF01033531