@article{MAN_1963__150_161055,
     author = {H. SALZMANN},
     title = {Zur {Klassifikation} topologischer {Ebenen.}},
     journal = {Mathematische Annalen},
     pages = {226--241},
     year = {1963},
     volume = {150},
     url = {http://geodesic.mathdoc.fr/item/MAN_1963__150_161055/}
}