1. Institute of Physics; Academy of Sciences of the Czech Republic; v.v.i, Na Slovance 2 182 21 Prague Czech Republic
2. Faculty of Nuclear Physics and Physical Engineering; Czech Technical University in Prague; Zikova 1 160 00 Prague Czech Republic
3. Solartec s.r.o.; Televizní 2618; 756 61 Rožnov pod Radhoštěm Czech Republic
4. Institute of Power and Applied Electrical Engineering; FEEIT; Slovak University of Technology in Bratislava; Ilkovičova 3 812 19 Bratislava Slovakia