Authors
Sergiu Hațegan
Faculty of Physics, West University of Timisoara, Timisoara, Romania
Marius Paulescu
Faculty of Physics, West University of Timisoara, Timisoara, Romania
© 2021 Sergiu Hațegan, Marius Paulescu, published by West University of Timisoara
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.