@article{MAN_1977__225_162927,
     author = {G\"unter Frank and Wilhelm Hennekemper and Gisela Polloczek},
     title = {\"Uber die {Nullstellen} meromorpher {Funktionen} und deren {Ableitungen.}},
     journal = {Mathematische Annalen},
     pages = {145--154},
     publisher = {mathdoc},
     volume = {225},
     year = {1977},
     zbl = {0324.30044},
     url = {http://geodesic.mathdoc.fr/item/MAN_1977__225_162927/}
}