Authors
Guldana Khabdullina
guldana.abdukhalykkyzy@gmail.com
Kostanay Regional University, Kostanay, Kazakhstan
Dace Paule
Institute of Energy Systems and Environment, Riga Technical University, Riga, Latvia
Ieva Pakere
Institute of Energy Systems and Environment, Riga Technical University, Riga, Latvia
Asset Khabdullin
Seifullin Kazakh Agro-Technical Research University, Astana, Kazakhstan
Dagnija Blumberga
Institute of Energy Systems and Environment, Riga Technical University, Riga, Latvia