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@article{MZ_1978__164_172769, author = {David L. DeGeorge and William L. Reddy}, title = {A {Hopf} {Inequality} for {Branch} {Sets.}}, journal = {Mathematische Zeitschrift}, pages = {81--92}, publisher = {mathdoc}, volume = {164}, year = {1978}, zbl = {0373.55002}, url = {http://geodesic.mathdoc.fr/item/MZ_1978__164_172769/} }
David L. DeGeorge; William L. Reddy. A Hopf Inequality for Branch Sets.. Mathematische Zeitschrift, Tome 164 (1978), pp. 81-92. http://geodesic.mathdoc.fr/item/MZ_1978__164_172769/