Mizuta, Yoshihiro, and Tetsu Shimomura. “Boundary Limits of Spherical Means for BLD and Monotone BLD Functions in the Unit Ball”. Annales Fennici Mathematici 24, no. 1 (February 1, 1999): 45–60. Accessed May 21, 2024. https://afm.journal.fi/article/view/134939.