TY  - BOOK
AU  - Lewis H R
AU  -  Papadimitriou C H
TI  - Elements of the theory of computation
T2  - Prentice Hall Software Series
U1  - D65,8(B), M1;2-;3 
PY  - 1981///
CY  - Englewood
PB  - cliffs Prentice Hall       
KW  - Computer science
ER  -