@article{CMH_1956__31_139142,
     author = {Alfred Aeppli},
     title = {Modifikation von reellen und komplexen {Mannigfaltigkeiten.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {219--301},
     year = {1956},
     volume = {31},
     zbl = {0098.36403},
     url = {http://geodesic.mathdoc.fr/item/CMH_1956__31_139142/}
}