Panamarchuk О. V. A diffusion process on a plane with membranes on two intersecting straight lines. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 51, n. 9, p. 1210–1216, 1999. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4717. Acesso em: 5 dec. 2025.