1.
Stein E. Milestones of Direct Variational Calculus and its Analysis from the 17th Century until today and beyond – Mathematics meets Mechanics – with restriction to linear elasticity. Comp. Assist. Methods Eng. Sci. 2017;19(1):7-91. Accessed June 21, 2025. https://cames.ippt.pan.pl/index.php/cames/article/view/100