ZERNOV, A. E. On the Solvability and Asymptotics of Solutions of One Functional Differential Equation with Singularity. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 53, n. 4, p. 455–465, 2001. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4268. Acesso em: 14 apr. 2025.