Authors
Camelia Bărbatu
Babeş-Bolyai University, Faculty of Mathematics and Computer Sciences, Department of Mathematics, Cluj-Napoca, Romania
Daniel Breaz
1 Decembrie University, Faculty of Science, Department of Mathematics, Alba-Iulia, Romania
© 2020 Camelia Bărbatu, Daniel Breaz, published by Lucian Blaga University of Sibiu
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.