TY  - BOOK
AU  - Hellerman Herbert
AU  -  Conroy Thomas F
TI  - Computer system performance
T2  - McGraw-Hill computer science series
U1  - B28930aD65,8(B), L51;2   TD 
PY  - 1975///
CY  - New York 
PB  - McGraw-Hill      
KW  - Operational research
ER  -