Височанський, І. В., and І. М. Самчук. “Geological Factors in the Formation Conditions of Traps in the Orchyk Depression Perm Deposits of Dnieper-Donets Basin”. Visnyk of V. N. Karazin Kharkiv National University, Series "Geology. Geography. Ecology", no. 45, Mar. 2017, pp. 28-38, https://periodicals.karazin.ua/geoeco/article/view/8178.