Aliyan A. Estaremi Y. Ebadian A., Conditional Carleson Measures and Related Operators on Bergman Spaces, Bull. Iran. Math., 45 (2019), 997–1010.
 Chen Z., Jiang L. and Yan Q., An upper bound of the essential norm of composition operators between weighted Bergman spaces, Acta Math. Sci. Ser. B (Engl. Ed.)., 34 (2014), 1145–1156.
 Cuckovic Z. and Zhao R., Weighted composition operators between different weighted Bergman spaces and different Hardy spaces, Illi.Jour. Math., 51 (2007) 479-498.
 Jabbarzadeh M.R and Hassanloo M., Conditional Expectation Operators on the Bergman Spaces, J. Math. Anal. Appl., 385 (2012), 322-25.
 Lindström M. and Saukko E., Essential norm of weighted composition operators and difference of composition operators between standard weighted Bergman spaces, Complex Anal. Oper. Theory., 9 (2015), 1411–1432.
 Shapiro J.H., The essential norm of a composition operator, Ann. Math., 125 (1987), 375–404.
 Sharma A.K., and Ueki S.-i., Composition operators between weighted Bergman spaces with admissible BÃ©kollÃ© weights, Banach J. Math. Anal, 8 (2014), 64-88.
 Zhou Z.H, Liang Y. X. and Zeng H.G, Hong Gang Essential norms of weighted composition operators from weighted Bergman space to mixed-norm space on the unit ball, Acta Math. Sin. (Engl. Ser.)., 29 (2013), 547–556.
 Zhu K.H., Duality of Bloch spaces and norm convergence of Taylor series, Mich. Math. Jour., 38 (1991), 89-101.