Diffusion in a plane with semipermable membranes on two straight lines. Neliniini Kolyvannya, [S. l.], v. 2, n. 4, p. 439–447, 1999. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/79. Acesso em: 22 jan. 2026.