@article{Ésik_1986, title={Varieties and general products of top-down algebras}, volume={7}, url={https://cyber.bibl.u-szeged.hu/index.php/actcybern/article/view/3297}, number={3}, journal={Acta Cybernetica}, author={Ésik, Zoltán}, year={1986}, month={Jan.}, pages={293-298} }