KURKA, O. On the variation of the Hardy–Littlewood maximal function. Annales Fennici Mathematici, [S. l.], v. 40, n. 1, p. 109–133, 2015. DOI: 10.5186/aasfm.2015.4003. Disponível em: https://afm.journal.fi/article/view/135532. Acesso em: 2 may. 2024.