HAN, Y.; LI, J.; LIN, C.-C. Criterions of the L^2 boundedness and sharp endpoint estimates for singular integral operators on product spaces of homogeneous type . ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE, [S. l.], v. 16, n. 3, p. 845-907, 2016. DOI: 10.2422/2036-2145.201411_002. Disponível em: https://journals.sns.it/index.php/annaliscienze/article/view/469. Acesso em: 20 feb. 2026.