Belan, E.P. and Lykova, O.B. (1996) “Theorem on the central manifold of a nonlinear parabolic equation”, Ukrains’kyi Matematychnyi Zhurnal, 48(8), pp. 1021–1036. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/5246 (Accessed: 6 December 2025).