TY  - GEN
AU  - Lewis, Harry R.
AU  - Papadimitriou, Christos H.
TI  - Elements of the theory of computation
SN  - 8120310160
U1  - 511.3 
PY  - 1981///
CY  - New Delhi
PB  - Prentice- Hall
KW  - Mathematical logic
ER  -