V. F. Kovalyov, “Filtration calculat in of flood-beds with an arbitrarily given water-apron line ”, Ukr. Mat. Zhurn., vol. 18, no. 2, pp. 123–126, Mar. 1966, Accessed: Feb. 17, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/8725