“Chlorine Residual Behavior in Water Disinfection Using Combined Sand Media With Chlorine Application”. Visnyk of V. N. Karazin Kharkiv National University. Series Geology. Geography. Ecology, no. 63 (December 1, 2025): 507–515. Accessed October 23, 2026. https://periodicals.karazin.ua/geoeco/article/view/28623.