Authors
Svetlana Raita
Riga Technical University, Institute of Energy Systems and Environment, Riga, Latvia
Kriss Spalvins
Riga Technical University, Institute of Energy Systems and Environment, Riga, Latvia
Evalds Raits
Latvia University of Life Sciences and Technologies, Faculty of Food Technology, Jelgava, Latvia
Inese Silicka
Rezekne Academy of Technologies, Faculty of Economics and Management, Rezekne, Latvia
Dagnija Blumberga
Riga Technical University, Institute of Energy Systems and Environment, Riga, Latvia