TY  - BOOK
AU  - Aigner, Martin
TI  -  A course in enumeration
SN  - 9788132206712
U1  - 511.62 
PY  - 2010///
CY  - New York
PB  - Springer, 
KW  - Combinatorial enumeration problems
KW  - Combinatorial configurations and designs , matroids
ER  -