CHAIKOVS'KYI, A. V. On solutions defined on an axis for differential equations with shifts of the argument. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 63, n. 9, p. 1290–1296, 2011. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2806. Acesso em: 17 apr. 2025.