Zhumatov, S.S. (2009) “Stability of a program manifold of control systems with locally quadratic relations”, Ukrains’kyi Matematychnyi Zhurnal, 61(3), pp. 418–424. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3030 (Accessed: 10 April 2025).