Гусєва, Н. В., and О. М. Задєсєнцев. “Demographic Degradation of Severodonetsk-Lysychansk Agglomeration in the Post-Soviet Period”. Visnyk of V. N. Karazin Kharkiv National University. Series Geology. Geography. Ecology, no. 47, Feb. 2018, pp. 84-91, https://periodicals.karazin.ua/geoeco/article/view/10333.