Удалов, І. В., and А. В. Кононенко. “Main Prerequisites of Groundwater Quality Decline in the Cretaceous Water Intakes of the Eastern Ukraine”. Visnyk of V. N. Karazin Kharkiv National University. Series Geology. Geography. Ecology0, no. 44 (December 15, 2016): 63-70. Accessed December 23, 2025. https://periodicals.karazin.ua/geoeco/article/view/7493.