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. CAMES [Internet]. 2019 Jul. 2 [cited 2025 Jan. 12];25(4):141-225. Available from: https://cames3.ippt.pan.pl/index.php/cames/article/view/256