TY  - BOOK
AU  - Hellerman Herbert
AU  -  Conroy Thomas F
TI  - Computer system performance
T2  - Mcgraw-Hill computer science series
U1  - B28930aD65,8(B), L51   L51;6   L51;3   TD 
PY  - 1975///
CY  - New York    
PB  -  Mcgraw-Hill        
KW  - computer
ER  -