KRUGLOV, V. E. Solution of a Linear Second-Order Differential Equation with Coefficients Analytic in the Vicinity of a Fuchsian Zero Point. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 64, n. 10, p. 1381–1393, 2012. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2666. Acesso em: 5 dec. 2025.