TY  - BOOK
AU  - Vilenkin,N.dI8A
TI  - Combinatorial mathematics for recreation
PY  - 1972///
CY  - [S.l.]
PB  - MIR Publishers
UR  - http://www.amazon.com/exec/obidos/ASIN/B0012OI1M2/chopaconline-20
ER  -