On normal families of meromorphic functions

In this paper, we consider some normality criterion concerning shared values. Let F be a family of meromorphic functions defined in a domain D . Let k , n ⩾ k + 2 be positive integers and a ≠ 0 be a finite complex number. If ( f n ) ( k ) and ( g n ) ( k ) share a in D for every pair of functions f , g ∈ F , then F is normal in D .