@article{MAN_1930__102_159369,
     author = {St. Cohn-Vossen},
     title = {Unstarre geschlossene {Fl\"achen}},
     journal = {Mathematische Annalen},
     pages = {10--29},
     year = {1930},
     volume = {102},
     zbl = {55.1016.03},
     url = {http://geodesic.mathdoc.fr/item/MAN_1930__102_159369/}
}