A numerical-analytic method for studying boundary-value problems for semilinear differential systems. Neliniini Kolyvannya, [S. l.], v. 13, n. 1, p. 39–49, 2010. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/549. Acesso em: 21 jan. 2026.