Authors
Alina-Mihaela Patriciu
“Dunarea de Jos” University of Galati, Faculty of Sciences and Environment, Department of Mathematics and Computer Sciences, Domneasca Street,, Galati, Romania
© 2018 Valeriu Popa, Alina-Mihaela Patriciu, published by University of Silesia in Katowice, Institute of Mathematics
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.