1. Institute of Petrochemistry and Catalysis, Russian Academy of Sciences, Ufa, Russia
2. Actinium Chemical Research, Rome, Italy
3. Laboratory of Renewable Energies-Photovoltaics, National Institute for R&D in Electrochemistry and Condensed Matter INCEMC-Timisoara, Timisoara, Romania
4. Institute of Physics, Budapest University of Technology and Economics, Budapest, Hungary