Nonclassical boundary problem for partial differential equation of variable order. Neliniini Kolyvannya, [S. l.], v. 29, n. 2, 2026. DOI: 10.3842/nosc.v28i2.1207. Disponível em: https://nosc.imath.kiev.ua/index.php/nosc/article/view/1207. Acesso em: 9 oct. 2026.