Authors
S. Kajántó
Faculty of Mathematics and Computer Science, “Babeş-Bolyai” University, Romania
A. Lukács
Faculty of Mathematics and Computer Science, “Babeş-Bolyai” University, Romania
© 2018 S. Kajántó, A. Lukács, published by Sapientia Hungarian University of Transylvania
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.