Safiullin, M. R., et al. “A Formalized Evolution of the Efficiency of Regional Higher Education Systems through the Prism of the Relationship of Inputs and Outputs of Flow Values”. Economics of Science, vol. 5, no. 4, Dec. 2019, pp. 248-57, https://doi.org/10.22394/2410-132X-2019-5-4-2478-257.