@article{Ilie_Salomaa_1996, title={On regular characterizations of languages by grammar systems}, volume={12}, url={https://cyber.bibl.u-szeged.hu/index.php/actcybern/article/view/3472}, number={4}, journal={Acta Cybernetica}, author={Ilie, Lucian and Salomaa, Arto}, year={1996}, month={Jan.}, pages={411-425} }