Authors
Armands Gravelsins
Institute of Energy Systems and Environment, Riga Technical University, Riga, Latvia
Gatis Bazbauers
Institute of Energy Systems and Environment, Riga Technical University, Riga, Latvia
Andra Blumberga
Institute of Energy Systems and Environment, Riga Technical University, Riga, Latvia
Dagnija Blumberga
Institute of Energy Systems and Environment, Riga Technical University, Riga, Latvia