Authors
Janis Narbuts
Institute of Energy Systems and Environment, Riga Technical University, Riga, Latvia
Ruta Vanaga
Institute of Energy Systems and Environment, Riga Technical University, Riga, Latvia
Ritvars Freimanis
Institute of Energy Systems and Environment, Riga Technical University, Riga, Latvia
Andra Blumberga
Institute of Energy Systems and Environment, Riga Technical University, Riga, Latvia