@article{MAN_1974__212_182739,
     author = {Ludger Kaup and Gottfried Barthel},
     title = {Homotopieklassifikation einfach zusammenh\"angender normaler kompakter komplexer {Fl\"achen.}},
     journal = {Mathematische Annalen},
     pages = {113--144},
     publisher = {mathdoc},
     volume = {212},
     year = {1974},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MAN_1974__212_182739/}
}