@article{MZ_1968__107_171058,
     author = {Robert J. Koch and Haskell Cohen},
     title = {Non-Euclidean {Points} in {Sphere-like} {Spaces.}},
     journal = {Mathematische Zeitschrift},
     pages = {127--132},
     publisher = {mathdoc},
     volume = {107},
     year = {1968},
     zbl = {0162.27104},
     url = {http://geodesic.mathdoc.fr/item/MZ_1968__107_171058/}
}