Varma, G. P. Saradhi. Theory of computation : formal languages and automata theory/ by G. P. Saradhi Varma and B. Thirupathi Rao - Chennai : Scitech Publications 2005 - verius pagging : ills.fig ; 23cm. ISBN: 9788188429943 150.00 Dewey Class. No.: 005.131 / V522