Authors
Aivis Kļaviņš
Institute of Energy Systems and Environment, Riga Technical University, Latvia
Vladimirs Kirsanovs
Institute of Energy Systems and Environment, Riga Technical University, Latvia
Ieva Pakere
Institute of Energy Systems and Environment, Riga Technical University, Latvia
Andrej Dávid
Department of Water Transport, Faculty of Operation and Economics of Transport and Communications, University of Zilina, Zilina, Slovakia