Rational spectral collocation combined with the singularity separated method for second-order singular perturbation problems. Neliniini Kolyvannya, [S. l.], v. 24, n. 2, p. 197–209, 2021. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/1025. Acesso em: 10 dec. 2025.