MOROZOV, V.; TOKAREV, N.; LEZHNEV, V. A variational problem for the biharmonic equation. Numerical Methods and Programming (Vychislitel’nye Metody i Programmirovanie), [S. l.], v. 13, n. 33, p. 409–412, 2012. Disponível em: https://en.num-meth.ru/index.php/journal/article/view/536. Acesso em: 23 apr. 2024.