“The L2-Norm Error Estimate of Nonconforming Finite Element Method for the 2nd Order Elliptic Problem with the Lowest Regularity” (2000) Journal of Computational Mathematics, 18(3), pp. 277–282. Available at: https://global-sci.com/index.php/JCM/article/view/11365 (Accessed: 6 December 2025).