Tran, T.L. (1999) “Lyapunov transformation and stability of differential equations in banach spaces”,
Ukrains’kyi Matematychnyi Zhurnal, 51(10), pp. 1417–1424. Available at:
https://umj.imath.kiev.ua/index.php/umj/article/view/4741 (Accessed: 26 April 2025).