Avad-Tulchevskiy, R.R.Avad-TulchevskiyPilova, K.K.PilovaZuyenok, I.I.Zuyenok2017-05-202017-05-202016-12http://ir.nmu.org.ua/handle/123456789/149276enMARKET OF OPERATIONG SYSTEMS IN UKRAINEArticle