CHEN, Yanping; DING, Yong. A charaterization of commutators for parabolic singular integrals. Mathematica Scandinavica, Berkeley, CA, United States, v. 108, n. 1, p. 5–25, 2011. DOI: 10.7146/math.scand.a-15158. Disponível em: https://journals.msp.org/mscand/article/view/539. Acesso em: 24 jul. 2026.