BOZHONOK, E. V. On solutions to "almost everywhere" - Euler-Lagrange equation in Sobolev space $W_2^1$. Methods of Functional Analysis and Topology, [S. l.], v. 13, n. 3, p. 262–266, 2007. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/353. Acesso em: 16 dec. 2025.