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Additional information
L. V. Pisarzhevskii Institute of Physical Chemistry, Academy of sciences of the UkrSSR. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 1, No. 2, pp. 287–294, November, 1969.
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Mestechkin, M.M. Conditions for the representability of the density matrix. Theor Math Phys 1, 221–226 (1969). https://doi.org/10.1007/BF01028049
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DOI: https://doi.org/10.1007/BF01028049