Literature cited
C. Berge, Théorie des Graphes et ses Applications, Dunod, Paris (1958).
H.J. Ryser, Combinatorial Mathematics, John Wiley and Sons (1963).
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Translated from Ukrainskii Matematicheskii Zhurnal Vol.20, No.2, pp.243–245, March–April, 1968.
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Vinnichenko, N.G. Counting of abelian words formed from letters of some collection of alphabets. Ukr Math J 20, 218–220 (1968). https://doi.org/10.1007/BF01085538
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DOI: https://doi.org/10.1007/BF01085538