1. Faculty of Computer Science and Information Technologies, Saratov State University, 83, Astrakhanskaya Str., 410600 Saratov, Russia
2. Faculty of Economics, Saratov State University, 83, Astrakhanskaya Str., 410600 Saratov, Russia
3. Institute of Management in Economic, Environmental and Social Systems, Southern Federal University, 105/42, Bolshaya Sadovaya Str., 344006 Rostov-on-Don, Russia
4. Faculty of Psychology, Pedagogies and Defectology, Don State Technical University, 1, Gagarin Sq., 344000 Rostov-on-Don, Russia