SamoilenkoA. M. “On the Reducibility of a System of Ordinary Differential Equations in the Vicinity of a Smooth Integral Manifold ”. Ukrains’kyi Matematychnyi Zhurnal 18, no. 6 (October 27, 1966): 41-64. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/8458.