@article{MZ_1926__25_167886,
     author = {H. Kneser},
     title = {Die {Deformationss\"atze} der einfach zusammenh\"angenden {Fl\"achen}},
     journal = {Mathematische Zeitschrift},
     pages = {362--372},
     year = {1926},
     volume = {25},
     zbl = {52.0573.01},
     url = {http://geodesic.mathdoc.fr/item/MZ_1926__25_167886/}
}