TY  - BOOK
AU  - Hopcroft, John E
AU  - Ullman, Jeffery D
TI  - INTRODUCTION TO AUTOMATA THEORY, LANGAUGES, AND COMPUTATION
SN  - 8185015961
U1  - 629.8312 
PY  - 1979///
CY  - Newdelhi
PB  - Narosa publishing house
KW  - pushdown automata
KW  - turing machines
KW  - preliminaries
N1  - Bibliography& index
ER  -