DONCHEV, T.; SLAVOV, I. Singularly perturbed delayed differential inclusions. Ann. Sofia Univ. Fac. Math. and Inf., [S. l.], v. 91, p. 61–71, 1999. Disponível em: https://ftl5.uni-sofia.bg/index.php/fmi/article/view/269. Acesso em: 11 apr. 2025.