WANG J, LV W R. The fixed points and hyper-order of solutions of second order linear differential equations with meromorphic coefficients[J]. Acta Math Appl Sinica, 2004, 27(1): 72-80.
[4]
LIU M S, ZHANG X M. Fixed points of meromorphic solutions of higher order linear differential equations[J]. Ann Acad Sci Fenn Math, 2006, 231: 191-211.