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Institute of Theoretical Physics, Academy of Sciences of the Ukrainian SSR. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 23, No. 2, pp. 260–272, May, 1975.
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Vakarchuk, I.A. Density matrices of a many-Boson system at low temperatures. Theor Math Phys 23, 496–505 (1975). https://doi.org/10.1007/BF01036160
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DOI: https://doi.org/10.1007/BF01036160