1. Department of Plastics and Rubber; Institute of Natural and Synthetic Polymers, Faculty of Chemical and Food Technology, Slovak University of Technology; Radlinského 9 812 37 Bratislava Slovakia
2. Centre of Polymer Systems, Tomas Bata University in Zlín; Nad Ovčírnou 3685 760 01 Zlín Czech Republic
3. Department of Electromagnetic Theory; Faculty of Electrical Engineering and Information Technology, Slovak University of Technology; Iľkovičova 3 812 19 Bratislava Slovakia