TY  - BOOK
AU  - Wallis, W. D
AU  - Wallis, W. D
AU  - J.C. George
TI  - Introduction to combinatorics
SN  - 9781439806227
U1  - 511.6 
PY  - 2015///
CY  - Boca
PB  - CRC Press
KW  - Combinatorial analysis	
ER  -