E. P. Belan and O. B. Lykova, “Theorem on the central manifold of a nonlinear parabolic equation”, Ukr. Mat. Zhurn., vol. 48, no. 8, pp. 1021–1036, Aug. 1996, Accessed: Feb. 17, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5246