TranThi Loan. “Lyapunov Transformation and Stability of Differential Equations in Banach Spaces”. Ukrains’kyi Matematychnyi Zhurnal 51, no. 10 (October 25, 1999): 1417–1424. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4741.