TY  - BOOK
AU  - Hopcroft, john E
AU  - Ullman, jeffrey D
TI  - Introduction to automata theory, languages, and computation
SN  - 9788185015961
U1  - 629.83 
PY  - 1994///
CY  - New delhi
PB  - Narosa publishing house
N1  - It includes bibliographical references and index
ER  -