[1]  Wang X L, Gong Y F. On stability of a class of singular integral with respect to path of integration. Acta Math Sinica, 1999, 42(2): 343--350 (in Chinese)

[2]  Zhang H M, Wang C R. On stability of Riemann boundary value problem with respect to path of boundary curve. J of Fuzhou Univ (Nat Sci Ed), 2001, 29(1): 1--4 (in Chinese)

[3]  Wang C R, Zhang H M, Zhu Y C.  The Riemann boundary value problem with respect to the perturbation of boundary curve. Complex Var and Elliptic Equ, 2006, 51(8--11): 831--845

[4]  Lin J, Wang C R. On stability of Cauchy type integral with kernel density of class H* with respect to path of integration for an open arc. Complex Var and Elliptic Equ, 2007, 52(10/11):  883--898

[5]  Zao Z. Singular Integral Equations. Beijing: Beijing Normal Univ, 1984 (in Chinese)

[6]  Lu J K. Boundary Value Problems for Analytic Functions. Singapore:  World Sci,  1993

[7]  Wang C R. Complex Variable Function Method. Xiamen: Xiamen Univ, 1999 (in Chinese)

[8]  Lu J K. Extension of solutions to Riemann boundary value problems and its application. Acta Math Sci, 2007, 27B(4): 694--702