@article{MAN_1875__9_156707,
     author = {Klein},
     title = {Ueber den {Zusammenhang} der {Fl\"achen}},
     journal = {Mathematische Annalen},
     pages = {476--482},
     publisher = {mathdoc},
     volume = {9},
     year = {1875},
     url = {http://geodesic.mathdoc.fr/item/MAN_1875__9_156707/}
}