TY JOUR TI The Main Problems of Distance Learning in Vocational Education in the Russian Federation KW optimization of training KW problems of training KW quality of teaching KW asynchronous distance learning KW software JO Bulletin of Kemerovo State University. Series: Humanities and Social Sciences AU Danilov, O.E. AU Korchak, E.V. AU Ershteyn, L.B. AU Yugova, N.L. PY 2021 IS 2021 PB Kemerovo State University