KovalevA. M., KravchenkoN. V., and NespirnyiV. N. “Necessary Condition for the Stabilizability of Nonlinear Systems With Respect to a Part of Variables in the Class of Discontinuous Controls”. Ukrains’kyi Matematychnyi Zhurnal 58, no. 10 (October 25, 2006): 1434–1440. Accessed November 25, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3544.