@article{Salomaa_Yu_1999, title={Generalized fairness and context-free languages}, volume={14}, url={https://cyber.bibl.u-szeged.hu/index.php/actcybern/article/view/3520}, number={1}, journal={Acta Cybernetica}, author={Salomaa, Kai and Yu, Sheng}, year={1999}, month={Jan.}, pages={193-203} }