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Translated from Matematicheskie Zametki, Vol. 21, No. 5, p. 595, May, 1977.
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Leont'ev, A.F. Birthday. Mathematical Notes of the Academy of Sciences of the USSR 21, 335 (1977). https://doi.org/10.1007/BF01788227
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DOI: https://doi.org/10.1007/BF01788227