@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/}
}