[1] Choe B, Kawa T, Koo H. Hilbert-Schmidt differences of composition operators on the Bergman spaces. Math Z, 2011, 269: 751-775
[2] Choe B, Koo H, Park I. Compact differences of composition operators on the Bergman spaces over the ball. Potential Anal, 2014, 40: 81-102
[3] Choe B, Koo H, Wang M, Yang J. Compact linear combinations of composition operators induced by linear fractional maps. Math Z, 2015, 280: 807-824
[4] Cowen C, MacCluer B. Composition Operators on Spaces of Analytic Functions. Boca Raton: CRC Press, 1995
[5] Jiang L, Ouyang C. Compact differences of composition operators on holomorphic function spaces in the unit ball. Acta Math Sci, 2011, 31B: 1679-1693
[6] Koo H, Wang M. Cancellation properties of composition operators on Bergman spaces. J Math Anal Appl, 2015, 432: 1174-1182
[7] Kriete T, Moorhouse J. Linear relations in the Calkin algebra for composition operators. Trans Amer Math Soc, 2007, 359: 2915-2944
[8] MacCluer B, Shapiro J. Angular derivatives and compact composition operators on the Hardy and Bergman spaces. Canad J Math, 1986, 38: 878-906
[9] Moorhouse J. Compact differences of composition operators. J Funct Anal, 2005, 219: 70-92
[10] Shapiro J. Composition Operators and Classical Function Theory. New York: Springer, 1993
[11] Zhu K. Operator Theory in Function Spaces. New York: Marcel Dekker, 1990
[12] Zhu K. Spaces of Holomorphic Functions in the Unit Ball. New York: Springer, 2005
[13] Zhu K. Compact composition operators on Bergman spaces of the unit ball. Houston J Math, 2007, 33: 273-283