We deal with the uniqueness problem for analytic functions sharing four distinct values in an angular domain and obtain some theorems which improve the result given by Cao and Yi [J. Math. Anal. Appl. 358 (2009)].
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-ap99-1-5, author = {Hong-Yan Xu and Ting-Bin Cao}, title = {Uniqueness of two analytic functions sharing four values in an angular domain}, journal = {Annales Polonici Mathematici}, volume = {98}, year = {2010}, pages = {55-65}, zbl = {1206.30043}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-ap99-1-5} }
Hong-Yan Xu; Ting-Bin Cao. Uniqueness of two analytic functions sharing four values in an angular domain. Annales Polonici Mathematici, Tome 98 (2010) pp. 55-65. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-ap99-1-5/