Authors
Khalima Turgumbayeva
Institute of Energy Systems and Environment, Riga Technical University, Riga, Latvia
Dagnija Blumberga
Institute of Energy Systems and Environment, Riga Technical University, Riga, Latvia
Aziza Aipenova
Suleyman Demirel University, Kaskelen city, Kazakhstan
Tuleuzhan Beisekova
Almaty University of Power Engineering and Telecommunications, Almaty, Kazakhstan