Authors
Kriss Spalvins
Institute of Energy Systems and Environment, Riga Technical University, Azenes iela 12/1,, Riga, Latvia
Dagnija Blumberga
Institute of Energy Systems and Environment, Riga Technical University, Azenes iela 12/1,, Riga, Latvia
© 2018 Kriss Spalvins, Dagnija Blumberga, published by Riga Technical University
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.