@article{Mateescu_1991, title={Special families of matrix languages and decidable problems}, volume={10}, url={https://cyber.bibl.u-szeged.hu/index.php/actcybern/article/view/3392}, number={1-2}, journal={Acta Cybernetica}, author={Mateescu, Alexandru}, year={1991}, month={Jan.}, pages={45-51} }