A note on a famous theorem of Pang and Zalcman
  In this paper, by studying the famous theorem of Pang and Zalcman, we find a normal family and obtain a result, which is an improvement of Pang and Zalcman's theorem in some sense. Meanwhile, several examples are provided to show that our result's conditions are necessary. 
Feng L\"u, Junfeng Xu and Hongxun Yi
math.CV