Superconvergence Analysis of $C^m$ Finite Element Methods for Fourth-Order Elliptic Equations I: One Dimensional Case. Commun. Comput. Phys. [Internet]. 2023 Jun. 6 [cited 2026 Feb. 26];33(5):1466-508. Available from: https://global-sci.com/index.php/cicp/article/view/7178