NILSSON, Andreas. $L^p$-estimates for mixed singular operators. Mathematica Scandinavica, Berkeley, CA, United States, v. 84, n. 2, p. 195–202, 1999. DOI: 10.7146/math.scand.a-13874. Disponível em: https://journals.msp.org/mscand/article/view/954. Acesso em: 25 jul. 2026.