Geodesic
On Uniqueness of Meromorphic Functions with Shared Four Values in Some Angular Domains
Bulletin of the Malaysian Mathematical Society, Volume 31 (2008) no. 1

See the original article notice from the Bulletin of the Malaysian Mathematical Sciences Society website source

In this paper, we prove the uniqueness of meromorphic functions with shared four values in some angular domains. Our results consider the cases of the finite order and infinite order which improved the theorem of J.H. Zheng.
Classification: 30D35. 
Junfeng Xu; Hongxun Yi. On Uniqueness of Meromorphic Functions with Shared Four Values in Some Angular Domains. Bulletin of the Malaysian Mathematical Society, Volume 31 (2008) no. 1. http://geodesic.mathdoc.fr/item/BMMS_2008_31_1_a5/
@article{BMMS_2008_31_1_a5,
     author = {Junfeng Xu and Hongxun Yi},
     title = {On {Uniqueness} of {Meromorphic} {Functions} with {Shared} {Four} {Values} in {Some} {Angular} {Domains}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {2008},
     volume = {31},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/BMMS_2008_31_1_a5/}
}
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