@article{MAN_1877__12_156789,
     author = {Klein},
     title = {Weitere {Untersuchungen} \"uber das {Ikosa\"eder}},
     journal = {Mathematische Annalen},
     pages = {503--560},
     publisher = {mathdoc},
     volume = {12},
     year = {1877},
     url = {http://geodesic.mathdoc.fr/item/MAN_1877__12_156789/}
}