IVOCHKINA, N.; FILIMONENKOVA, N. V. On two symmetries in the theory of $m$-Hessian operators. Topological Methods in Nonlinear Analysis, [S. l.], v. 52, n. 1, p. 31–47, 2018. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2017.035. Acesso em: 18 jan. 2022.