Kozyrevа О., R. Sahaidak-Nikitiuk, V. Yevtushenko, Y. Derenskaya, and G. Ievtushenko. “Research of the Level of Socio-Economic Development of Ukrainian Regions”. Technology Audit and Production Reserves, vol. 4, no. 5(36), July 2017, pp. 4-15, doi:10.15587/2312-8372.2017.108416.