@article{Ferenc_2017, title={Preface}, volume={23}, url={https://cyber.bibl.u-szeged.hu/index.php/actcybern/article/view/3934}, DOI={10.14232/actacyb.23.2.2017.1}, number={2}, journal={Acta Cybernetica}, author={Ferenc, Rudolf}, year={2017}, month={Jan.}, pages={439} }