Authors
Csaba Szántó
Babeş-Bolyai University, Faculty of Mathematics and Computer Science, Cluj-Napoca, Romania
István Szöllősi
Babeş-Bolyai University, Faculty of Mathematics and Computer Science, Cluj-Napoca, Romania
© 2020 Csaba Szántó, István Szöllősi, published by Sapientia Hungarian University of Transylvania
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.