@article{1183530215, author = {Ess\'en, Matts}, title = {A generalization of the Ahlfors-Heins theorem}, journal = {Bull. Amer. Math. Soc.}, volume = {75}, number = {5}, year = {1969}, pages = { 127-131}, language = {en}, url = {http://dml.mathdoc.fr/item/1183530215} }
Essén, Matts. A generalization of the Ahlfors-Heins theorem. Bull. Amer. Math. Soc., Tome 75 (1969) no. 5, pp. 127-131. http://gdmltest.u-ga.fr/item/1183530215/