TY  - BOOK
AU  - Keys,Paul
TI  - Operational research and systems: the systemic nature of operational research 
SN  - 0306436426 :
U1  - 003 
PY  - 1991///
CY  - New York
PB  - Plenum Press
KW  - Operations research
KW  - System analysis
N1  - Includes bibliographical references and index
ER  -