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[2]
Carlitz L., 1960, P AM MATH SOC, V11, P452
[3]
Gould H. W., 1960, P AM MATH SOC, V11, P447
[4]
Jordan C., 1947, CALCULUS FINITE DIFF
[5]
Riordan J., 1958, INTRO COMBINATORIAL
[7]
[No title captured]