TY  - BOOK
AU  - Hopcroft, John E.
AU  - Motwani, Rajeev.
AU  - Ullman, Jeffrey D.
TI  - Introduction to automata theory languages and computation
SN  - 8178083477
U1  - 511.3  2
PY  - 2002///
CY  - New Delhi
PB  - Pearson Education
KW  - Regular expressions and languages
KW  - Pushdown automata
KW  - Intratable problems
ER  -