KOVALYOV, V. F. Filtration calculat in of flood-beds with an arbitrarily given water-apron line . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 18, n. 2, p. 123–126, 1966. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8725. Acesso em: 17 feb. 2026.