CHUIKO, S. M. Least-squares method in the theory of ill-posed linear boundary-value problems with pulse action. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 62, n. 5, p. 690–697, 2010. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2899. Acesso em: 5 dec. 2025.