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Additional information
Institute of Theoretical Physics, Ukrainian SSR Academy of Sciences. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 58, No. 1, pp. 61–71, January, 1984.
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Belokolos, E.D., Petrina, D.Y. Connection between the approximating Hamiltonian method and theta-function integration. Theor Math Phys 58, 40–46 (1984). https://doi.org/10.1007/BF01031033
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DOI: https://doi.org/10.1007/BF01031033