[1] Yang L. Value distribution theory and its new research. Beijing: Science Press, 1982

[2] He Y Z, Xiao X Z. Algebroidal function and ordinary differential equation (in Chinese). Beijing: Science Press, 1988

[3] Huo Y Y, Sun D C, Algebroidal function and its derived function in unit circular disc. Acta Math Sci, 2009, 29B(1): 129–139

[4] Sun D C. Borel direction of meromorphic function and its derivative. Chinese Annals of Mathematics, 1985, 6A(4): 493–97

[5] Sun D C. The common Borel direction of infinity order meromorphic function and its derivative. Acta Mathematica Sinica, 1987, 30(5): 641–647

[6] Zhang S H, Sun D C. Order of derivative of algebroidal function. Acta Mathematica Scientia, 2005, 25A(6): 933–938

[7] Sun D C. Common Borel points of a meromorphic function and its derivatives in the unit circle. Acta Math Sci, 1984, 4B(2): 227–32

[8] Sun D C, Gao Z S. On the operations of algebroid functions. Acta Math Sci, 2010, 30B(1): 247–256

[9] Zhang S H, Wu Z J, Sun D C. The connection between Borel direction of algebroid function and that of its coefficients function (accepted for publication in Chinese Math Ann)