TY  - BOOK
AU  - Halstead Maurice H
TI  - Elements of software science
T2  - Operating and programming systems series; 2. Computer Science library
U1  - D65,8(B)92, L7 
PY  - 1977///
CY  - New York    
PB  -  North-Holland        
KW  -  Computer program language
KW  - Computer science
ER  -