A. Rajagopal and S. M. Sivakumar, “Optimality of grids based on a combined r-h adaptive strategy”, Comp. Assist. Methods Eng. Sci., vol. 13, no. 2, pp. 247–268, Nov. 2022, Accessed: Jun. 30, 2025. [Online]. Available: https://cames.ippt.pan.pl/index.php/cames/article/view/950