TY JOUR TI Trends of Strategic Development and Investment Activities of Telecommunications Companies KW telecommunication companies KW strategic development KW investment KW innovation KW investment projects KW digital transformation KW MegaFon KW VimpelCom KW MTS KW Rostelecom KW Tele2 KW 5G JO Scientific Research and Development. Economics of the Firm AU Shchelina, A.V. PY 2019 IS 8 PB INFRA-M Academic Publishing LLC.