Direct Estimates for Certain Integral Type Operators. European Journal of Pure and Applied Mathematics, Maryland, USA, v. 11, n. 4, p. 958–975, 2018. DOI: 10.29020/nybg.ejpam.v11i4.3305. Disponível em: https://ejpam.com/index.php/ejpam/article/view/3305.. Acesso em: 19 jun. 2024.