APPLICATION OF FUNDAMENTAL LEMMA OF VARIATIONAL CALCULUS TO THE PROBLEM OF PLATEAU. Balkan Journal of Applied Mathematics and Informatics, [S. l.], v. 6, n. 1, p. 17–24, 2023. Disponível em: https://js.ugd.edu.mk/index.php/bjami/article/view/5646. Acesso em: 3 okt. 2025.