MELENTIJEVIC, P. Invariant gradient in refinements of Schwarz and Harnack inequalities. Annales Fennici Mathematici, [S. l.], v. 43, n. 1, p. 391–399, 2018. DOI: 10.5186/aasfm.2018.4324. Disponível em: https://afm.journal.fi/article/view/135731. Acesso em: 22 nov. 2024.