TY  - BOOK
AU  - Hopcroft, John E. & Ullman, Jeffrey D.
TI  - Introduction to automata theory, languages, and computation
SN  - 0-201-02988-X
U1  - 001.535 Hop/Ull 
PY  - 1979///
CY  - Addison-Wesley publishing company, London
ER  -