@article{MAN_1891__38_157557,
     author = {L. Heffter},
     title = {Ueber das {Problem} der {Nachbargebiete.}},
     journal = {Mathematische Annalen},
     pages = {477--508},
     publisher = {mathdoc},
     volume = {38},
     year = {1891},
     zbl = {23.0543.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1891__38_157557/}
}