Optimization techniques for mixed finite element methods of an semilinear elliptic PDEs - superconvergence. Gulf Journal of Mathematics, [S. l.], v. 3, n. 1, 2015. DOI: 10.56947/gjom.v3i1.170. Disponível em: https://www.gjom.org/index.php/gjom/article/view/170. Acesso em: 21 aug. 2026.