Grafakos, Loukas, Liguang Liu, and Dachun Yang. “Vector-Valued Singular Integrals and Maximal Functions on Spaces of Homogeneous Type”. Mathematica Scandinavica 104, no. 2 (June 1, 2009): 296–310. Accessed July 24, 2026. https://journals.msp.org/mscand/article/view/598.