Filipkovska, M. S. “Lagrange Stability and Instability of Nonregular Semilinear Differential-Algebraic Equations and Applications”.
Ukrains’kyi Matematychnyi Zhurnal 70, no. 6 (June 25, 2018): 823–847. Accessed April 26, 2025.
https://umj.imath.kiev.ua/index.php/umj/article/view/1598.