NakonechnaS. O. (1998) “On the application of approximation of the central manifold of a stationary point to one critical case”, Ukrains’kyi Matematychnyi Zhurnal, 50(3), pp. 430–432. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4944 (Accessed: 24November2024).