NguyenThe Hoan, NguyenMinh Man, and NguyenSinh Bay. 2008. “On the Asymptotic Equilibrium and Asymptotic Equivalence of Differential Equations in Banach Spaces”. Ukrains’kyi Matematychnyi Zhurnal 60 (5), 626–635. https://umj.imath.kiev.ua/index.php/umj/article/view/3181.