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Translated from Matematicheskie Zametki, Vol. 24, No. 2, pp. 295–299, August, 1978.
In conclusion, the authors thank the referees for useful remarks.
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Vilenkin, N.Y., Koganov, L.M. Combinatorial proof of certain identities. Mathematical Notes of the Academy of Sciences of the USSR 24, 658–660 (1978). https://doi.org/10.1007/BF01105323
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DOI: https://doi.org/10.1007/BF01105323