@article{CMH_1935__8_138644,
     author = {F. B\"abler},
     title = {\"Uber geschlossene ebene {Kurven} von beschr\"ankter {Kr\"ummung.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {5--47},
     year = {1935},
     volume = {8},
     url = {http://geodesic.mathdoc.fr/item/CMH_1935__8_138644/}
}