@article{MAN_1881__18_156970,
     author = {Schr\"oter},
     title = {Ueber das {Parallelhexagon} auf dem geradlinigen {Hyperboloid.}},
     journal = {Mathematische Annalen},
     pages = {428--442},
     publisher = {mathdoc},
     volume = {18},
     year = {1881},
     zbl = {13.0612.02},
     url = {http://geodesic.mathdoc.fr/item/MAN_1881__18_156970/}
}