@book {
author = {Horváth Géza and Nagy Benedek},
title = {FORMAL LANGUAGES AND AUTOMATA THEORY},
year = {2015},
publisher = {Typotex Kiadó},
isbn = {978 963 279 344 3},
URL = {https://edu.interkonyv.hu/konyvek/horvath-nagy-formal-languages-and-automata-theory/}
}