00724naa#a2200169#i#450# EN\\bibl\38460 20240427104135.6 2686-7788 20200623b2020####ek#y0engy0150####ca RU APPROACHES TO OPTIMIZING BUSINESS MODELS IN THE CONTEXT OF THE CURRENT CRISIS Journal article Angarsk Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University» 2020 3 с. Journal article local Математическое моделирование в общественных и гуманитарных науках. 00.77 grnti Zarubina Yuliya Vladimirovna angtu.editorum.ru