Wang, Jintao, Desheng Li, and Jinqiao Duan. “Compactly Generated Shape Index Theory and its Application to a Retarded Nonautonomous Parabolic Equation”. Topological Methods in Nonlinear Analysis 59, no. 1 (March 6, 2022): 1–33. Accessed July 22, 2024. https://apcz.umk.pl/TMNA/article/view/37626.