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Additional information
V. A. Steklov Mathematics Institute, USSR Academy of Sciences. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 37, No. 2, pp. 258–264, November, 1978.
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Ermilov, A.N., Kurbatov, A.M. Approximation of the Hamiltonian for (V,N) systems. Theor Math Phys 37, 1006–1010 (1978). https://doi.org/10.1007/BF01036371
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DOI: https://doi.org/10.1007/BF01036371