TY  - GEN
AU  - Allenby, R.B.J.T.
TI  - How to count  : an introduction to combinatorics
T2  - (Discrete mathematics and its applications)
SN  - 9781420082609
PY  - 2011///
CY  - Boca ration
PB  - CRC
KW  - Combinational analysis
KW  - Permutations and combinations
KW  - Inclusion - exclusion principle
ER  -