1. Lviv Polytechnic National University; 12, Bandera St. Lviv 79000 Ukraine
2. Scientific Research Company “Electron-Carat”; 202, Stryjska St. Lviv 79031 Ukraine
3. Institute of Fundamental Technological Research, Polish Academy of Science; 5B, Pawinskiego St. Warsaw 02-106 Poland
4. Pidstryhach Institute for Applied Problems of Mechanics and Mathematics; National Academy of Sciences of Ukraine; 3-b, Naukova St. Lviv 79060 Ukraine