AISAGALIEV, S. A. For the simplest problem of variational calculus. Journal of Mathematics, Mechanics and Computer Science, [S. l.], v. 71, n. 4, p. 20–31, 2011. Disponível em: https://bm.kaznu.kz/index.php/kaznu/article/view/216. Acesso em: 22 dec. 2024.