[1]  Nevanlinna R. Zur theorie der meromorphen funktionen. Acta Math, 1925, 46: 1--99

[2]  Lehto O. A generalization of picard's theorem. Ark Math, 1958, 3: 495--500

[3]  Hayman W K. Picard values of meromorphic functions and their derivatives. Ann of Math, 1959, 70: 9--42

[4]  Anderson J M, Baker I N, Clunie I G. The distribution of values of certain entire and meromorphic function. Math Z, 1981, 178: 509--525

[5]  Zhan Xiaoping. The value distribution of derivative of one kind of meromorphic functions. Acta Sci Nat Univ Norm Hunan (in Chinese), 1990,  4: 289--294

[6]  Yi hongxun. On the value distribution of ff'. Chinese Science Bulletin (in Chinese), 1989, 10: 727--730

[7]  Langley J K. Analogues of picard set for entire function and their derivatives. Contemporary Math, 1983, 25: 75--86

[8]  Zhan Xiaoping. Picard set of differential polynomials. Acta Mathematica Sinica (in Chinese), 1993, 36:  740--751

[9]  Zhan Xiaoping. Exeptional sets for differential polynomials f ^kQ
[ f ]+P
[F]. Science in China (in Chinese), 1993, 12A: 1233--1244

[10]  Zhan Xiaoping. Exceptional sets for differential polynomials. Acta Mathematica Sinica (in Chinese), 1995, 38: 386--394

[11]  Doeringer W. Exceptional values of differential polynomials. Pacific J Math, 1982, 98: 55--62

[12]  Zhan Xiaoping. Exception set for meromorphic functions and their derivavtives. Advances in Mathematics (in Chinese), 1992, 21: 232--242

[13]  Zhan Xiaoping, Cai Haitao. Exceptional sets for meromorphic function. Acta Mathematica Sinica (in Chinese), 2001, 44:  657--666

[14]  Zhan Xiaoping, Cai Haitao. The distribution of zeros for differential polynomials f ^KQ
[ f ]+P
[ f ]. Acta Mathematica Sinica (in Chinese), 2003,  46: 237--244

[15]  Tan Weiping, Zhan Xiaoping. The distribution of zeros for differential polynomials f ^kQ
[f ]+P
[ f ] in function f(z). Mathematics in Practice and Theory (in Chinese), 2009, 39: 149--157

[16]  Yang Le. The Value Distribution and Its New Research (in Chinese). Beijing: Science Press, 1982