Rostov-na-Donu VorontsovS.А. South-Russian Institute of Management RASHiGS under the President of the Russian Federation, 344002, Rostov-on-Don, Pushkinskaya str., 70raven_serg@mail.ru Read more about Vorontsov S. А. PonedelkovА.V. South-Russian Institute of Management RASHiGS under the President of the Russian Federation, 344002, Rostov-on-Don, Pushkinskaya str., 70ponedelkov@skags.ru Read more about Ponedelkov А. V.