@article{Nagy_1991, title={Boolean-type retractable automata with traps}, volume={10}, url={https://cyber.bibl.u-szeged.hu/index.php/actcybern/article/view/3393}, number={1-2}, journal={Acta Cybernetica}, author={Nagy, Attila}, year={1991}, month={Jan.}, pages={53-64} }