BIGUN, Ya. I.; FILIPCHUK, M. P. Numerical-analytic method for the investigation of multipoint boundary-value problems for systems of differential equations with transformed argument. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 50, n. 11, p. 1581–1584, 1998. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4815. Acesso em: 5 dec. 2025.