Finding asymptotic solutions of certain systems of nonlinear differential-difference equations. Neliniini Kolyvannya, [S. l.], v. 5, n. 4, p. 504–516, 2002. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/237. Acesso em: 22 jan. 2026.