Rachdi, L.T., and A. Rouz. “Homogeneous Besov Spaces Associated With the Spherical Mean Operator”. CUBO, A Mathematical Journal 13, no. 2 (June 1, 2011): 1–35. Accessed May 2, 2024. https://cubo.ufro.cl/ojs/index.php/cubo/article/view/1369.