Authors
Ritvars Freimanis
Institute of Energy Systems and Environment, Riga Technical University, Riga, Latvia
Zigmārs Zundans
Institute of Energy Systems and Environment, Riga Technical University, Riga, Latvia
Roberts Balins
Institute of Energy Systems and Environment, Riga Technical University, Riga, Latvia
Ruta Vanaga
Institute of Energy Systems and Environment, Riga Technical University, Riga, Latvia
Andra Blumberga
Institute of Energy Systems and Environment, Riga Technical University, Riga, Latvia