NILSSON, Andreas. $L^p$-estimates for mixed singular operators. MATHEMATICA SCANDINAVICA, [S. l.], v. 84, n. 2, p. 195–202, 1999. DOI: 10.7146/math.scand.a-13874. Disponível em: https://tidsskrift.dk/math/article/view/13874. Acesso em: 14 aug. 2026.