FILIPKOVSKA, M. S. Lagrange stability and instability of nonregular semilinear differential-algebraic equations and applications. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 70, n. 6, p. 823–847, 2018. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1598. Acesso em: 27 apr. 2025.