Superconvergence Analysis of $C^m$ Finite Element Methods for Fourth-Order Elliptic Equations I: One Dimensional Case. Commun. Comput. Phys. [Internet]. 2023 June 6 [cited 2026 Mar. 14];33(5):1466-508. Available from: https://gsp.tricubic.dev/cicp/article/view/7178