S. Skatulla and C. Sansour, “Essential boundary conditions in meshfree methods via a modified variational principle. Applications to shell computations”, Comp. Assist. Methods Eng. Sci., vol. 15, no. 2, pp. 123–142, Jul. 2022, Accessed: Jun. 22, 2025. [Online]. Available: https://cames.ippt.pan.pl/index.php/cames/article/view/752