In this paper, we prove a result on uniqueness of meromorphic functions sharing three values counting multiplicity. As applications of this, many known results can be improved. Examples are provided to show that the results in this paper are best possible.
Xiao-Min LI. Hong-Xun YI. "Meromorphic functions sharing three values." J. Math. Soc. Japan 56 (1) 147 - 167, January, 2004. https://doi.org/10.2969/jmsj/1191418699