APUSHKINSKAYA, D.; FUCHS, M. Partial regularity for higher order variational problems under anisotropic growth conditions. Annales Fennici Mathematici, [S. l.], v. 32, n. 1, p. 199–214, 2007. Disponível em: https://afm.journal.fi/article/view/135188. Acesso em: 25 nov. 2024.