Uniqueness of Some Differential Polynomials of Meromorphic Functions
  In this paper, we prove some uniqueness results which improve and generalize several earlier works. Also, we prove a value distribution result concerning $f^{(k)}$ which provides a partial answer to a question of Fang and Wang [A note on the conjectures of Hayman, Mues and Gol'dberg, Comp. Methods, Funct. Theory (2013)13, 533-543]. 
Kuldeep Singh Charak and Banarsi Lal
math.CV