Authors
Ilze Polikarpova
Institute of Energy Systems and Environment, Riga Technical University, Riga, Latvia
Dace Lauka
Institute of Energy Systems and Environment, Riga Technical University, Riga, Latvia
Dagnija Blumberga
Institute of Energy Systems and Environment, Riga Technical University, Riga, Latvia
Edgars Vigants
Institute of Energy Systems and Environment, Riga Technical University, Riga, Latvia