DERFEL, G.; BRUNT, B. van. On the balanced pantograph equation of mixed type. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 75, n. 12, p. 1627–1634, 2024. DOI: 10.3842/umzh.v75i12.7654. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/7654. Acesso em: 5 apr. 2025.