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References:
[1] G. C. Rota: On the fоundatiоns оf cоmbinatоrial theоry I. Zeit. für Wahr. 2 (1964), 340-368. MR 0174487
[2] C. Berge: Principles de cоmbinatоire. (1968).
[3] J. Riordan: An intrоductiоn tо cоmbinatоrial analysis. (1958).
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