Combinatorial mathematics for recreation /
Vilenkin, N. dI8A.
Combinatorial mathematics for recreation / N. dI8A. Vilenkin. - [S.l.] : MIR Publishers, 1972. - 1 v. (unpaged)
Combinatorial mathematics for recreation / N. dI8A. Vilenkin. - [S.l.] : MIR Publishers, 1972. - 1 v. (unpaged)