@article{CMH_1959__33_139171,
     author = {Alfred Aeppli},
     title = {Einige {\"Ahnlichkeits-} und {Symmetries\"atze} f\"ur differenzierbare {Fl\"achen} im {Raum.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {174--195},
     publisher = {mathdoc},
     volume = {33},
     year = {1959},
     zbl = {0196.24801},
     url = {http://geodesic.mathdoc.fr/item/CMH_1959__33_139171/}
}