@article{CMH_1956__31_139135,
     author = {Eva Maria Wirth},
     title = {\"Uber die {Bestimmung} des {Typus} einer {Riemannschen} {Fl\"ache.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {90--107},
     publisher = {mathdoc},
     volume = {31},
     year = {1956},
     zbl = {0073.06901},
     url = {http://geodesic.mathdoc.fr/item/CMH_1956__31_139135/}
}