TY  - BOOK
AU  - Nemhauser George L
AU  -  Wolsey Laurence A
TI  - Integer and combinatorial optimization
U1  - B2893P,3, M8 
PY  - 1988///
CY  - New York    
PB  -  John Wiley       
KW  -  Integer programming
KW  - Mathematical optimization
ER  -