1. Sobolev Institute of Mathematics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia;
2. Actinium Chemical Research Institute, Rome, Italy;
3. Laboratory of Structural and Computational Physical-Chemistry for Nanosciences and QSAR, Biology-Chemistry Department, Faculty of Chemistry, Biology, Geography, West University of Timisoara, Timisoara, Romania;
4. Romania Laboratory of Renewable Energies-Photovoltaics, R&D National Institute for Electrochemistry and Condensed Matter, Timisoara, Romania;
5. Regional Scientific and Educational Mathematical Center, Tomsk State University, Tomsk, Russia