ALESSANDRINI, G.; NESI, V. Beltrami operators, non-symmetric elliptic equations and quantitative Jacobian bounds. Annales Fennici Mathematici, [S. l.], v. 34, n. 1, p. 47–67, 2009. Disponível em: https://afm.journal.fi/article/view/135253. Acesso em: 25 nov. 2024.