GRAFAKOS, Loukas; LIU, Liguang; YANG, Dachun. vector-valued singular integrals and maximal functions on spaces of homogeneous type. Mathematica Scandinavica, Berkeley, CA, United States, v. 104, n. 2, p. 296–310, 2009. DOI: 10.7146/math.scand.a-15099. Disponível em: https://journals.msp.org/mscand/article/view/598. Acesso em: 24 jul. 2026.