Authors
E. Grebesh
Riga Technical University, Riga, Latvia
O. Linkevics
Riga Technical University, Riga, Latvia
© 2018 P. Ivanova, E. Grebesh, O. Linkevics, published by Institute of Physical Energetics
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.