@article{MZ_1975__143_172208,
     author = {David A. Drake},
     title = {Affine {Hjelmslev-Ebenen} mit verfeinerten {Nachbarschaftsrelationen.}},
     journal = {Mathematische Zeitschrift},
     pages = {15--26},
     publisher = {mathdoc},
     volume = {143},
     year = {1975},
     zbl = {0288.05016},
     url = {http://geodesic.mathdoc.fr/item/MZ_1975__143_172208/}
}