BazhuraB. P. and SamoilenkoA. M. (1994) “Investigation of a dynamical system in a neighborhood of an invariant toroidal manifold in the general case”, Ukrains’kyi Matematychnyi Zhurnal, 46(10), pp. 1399–1408. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/5620 (Accessed: 1September2024).