In this paper we study the problem of normal families of meromorphic functions concerning shared values. Let F be a family of meromorphic functions in the plane domain D \subseteq C and n be a positive integer. Let a, b be two finite complex constants such that a \neq 0. If n \geq 3 and f + a(f')^n and g + a(g')^n share b in D for every pair of functions f, g \in F, then F is normal in D. And some examples are provided to show the result is sharp.
"On normality of meromorphic functions with multiple zeros and sharing values,"
Turkish Journal of Mathematics: Vol. 36:
2, Article 7.
Available at: https://journals.tubitak.gov.tr/math/vol36/iss2/7