1. Taras Shevchenko National University of Kyiv, Kyiv 01033, Ukraine
2. Universidad Miguel Hernández de Elche, Centro de Investigación Operativa, Avda. Universidad s/n, Elche (Alicante) 03202, Spain
3. National Technical University of Ukraine, Kyiv Polytechnic Institute, Institute for Applied System Analysis, Peremogy Ave. 37, Kyiv 03056, Ukraine