KOROL', I. I.; RONTO, M. I. Investigation and solution of boundary-value problems with parameters by numerical-analytic method. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 46, n. 8, p. 1031–1042, 1994. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5656. Acesso em: 5 dec. 2025.