TY JOUR TI APPROACHES TO OPTIMIZING BUSINESS MODELS IN THE CONTEXT OF THE CURRENT CRISIS KW business models KW optimization KW key competencies of the company KW value chains JO Scientific Papers Collection of the Angarsk State Technical University AU Zarubina, Y.V. PY 2020 IS 2020 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»