1. Kaunas University of Applied Engineering Sciences, Department of Transport and Mechanical Engineering, Tvirtovės al. 35, LT-50155 Kaunas, Lithuania
2. Kaunas University of Technology, Department of Physical and Inorganic Chemistry, Radvilėnų road 19, LT-50254 Kaunas, Lithuania
3. Kaunas University of Technology, Department of Physics, Studentų Str. 50, LT-51368 Kaunas, Lithuania