TY  - BOOK
AU  - Williams paul H
TI  - Model building in mathematical programming
SN  - 978047997887
U1  - 519.7 WIL 2000 
PY  - 1978///
CY  - New York
PB  - John and Willew and sons 
KW  - mathematics
N1  - References and indexes included
ER  -