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V. A. Steklov Mathematics Institute, Academy of Sciences of the USSR, Moscow. M. V. Lomonosov Moscow State University. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 21, No. 2, pp. 258–265, November, 1974.
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Bogolyubov, N.N., Shumovskaya, A.G. & Shumovskii, A.S. Generalization of the minimax principle for model quasispin problems. Theor Math Phys 21, 1125–1130 (1974). https://doi.org/10.1007/BF01035560
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DOI: https://doi.org/10.1007/BF01035560