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