A. M. Kovalev, N. V. Kravchenko, and V. N. Nespirnyi, “Necessary condition for the stabilizability of nonlinear systems with respect to a part of variables in the class of discontinuous controls”, Ukr. Mat. Zhurn., vol. 58, no. 10, pp. 1434–1440, Oct. 2006, Accessed: Feb. 17, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3544