Martín, Joaquim, and Javier Soria. “Characterization of Rearrangement Invariant Spaces With Fixed Points for the Hardy-Littlewood Maximal Operator”. Annales Fennici Mathematici 31, no. 1 (February 1, 2006): 39–46. Accessed March 7, 2025. https://afm.journal.fi/article/view/135147.