TY  - BOOK
AU  - Stanley, Richard P. 
TI  - Enumerative combinatorics, vol. 1 
T2  - Bollobas, B. 
SN  - 9781107602625
U1  - 511.6 St251e2 
PY  - 2012///
CY  - New York 
PB  - Cambridge University Press 
KW  - Combinatorial enumeration problems
ER  -