TY  - BOOK
AU  - Bull,G.M.
AU  - Packham,S.F.G.
TI  - Time-sharing system
AV  - MATH QA76.5.B816 
PY  - 1971///
CY  - London
PB  -  : McGraw-Hill
KW  - Time sharing computer system
N1  - Includes bibliographical references
ER  -