TY  - BOOK
AU  - Erickson, Martin J.
AU  - 
TI  - Introduction to combinatorics
T2  - Wiley series in discrete mathematics and optimization
U1  - R  511.6  ERI-I2 
PY  - 2013///
CY  - John Wiley & Sons, New Jersy
KW  - Combinatorial analysis-- Mathematics
ER  -