Further results on the uniqueness of meromorphic functions and their   derivative counterpart sharing one or two sets
  In this paper we prove a number of results concerning uniqueness of a meromorphic function as well as its derivative sharing one or two sets. In particular, we deal with the specific question raised in [18], [19], [20] and ultimately improve the result of Banerjee-Bhattacharjee [4]. 
Abhijit Banerjee and Bikash Chakraborty
math.CV