Diversification of Higher Educational Institutions as a Factor of Sustainable Development of EducationArtur Gudmanian, Liubov Drotianko, Serhii Sydorenko, Serhii Ordenov and Nataliya ChenbaiE3S Web Conf., 208 (2020) 09039DOI: https://doi.org/10.1051/e3sconf/202020809039