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@article{MZ_1968__105_170977, author = {David A. Drake}, title = {Projective {Extensions} of {Uniform} {Affine} {Hjelmslev} {Planes.}}, journal = {Mathematische Zeitschrift}, pages = {196--207}, publisher = {mathdoc}, volume = {105}, year = {1968}, zbl = {0155.29801}, url = {http://geodesic.mathdoc.fr/item/MZ_1968__105_170977/} }
David A. Drake. Projective Extensions of Uniform Affine Hjelmslev Planes.. Mathematische Zeitschrift, Tome 105 (1968), pp. 196-207. http://geodesic.mathdoc.fr/item/MZ_1968__105_170977/