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@article{MZ_1968__108_171089, author = {Ferdinand D. Veldkamp}, title = {Collineation {Groups} in {Hjelmslev-Moufang} {Planes.}}, journal = {Mathematische Zeitschrift}, pages = {37--52}, publisher = {mathdoc}, volume = {108}, year = {1968}, zbl = {0165.54601}, url = {http://geodesic.mathdoc.fr/item/MZ_1968__108_171089/} }
Ferdinand D. Veldkamp. Collineation Groups in Hjelmslev-Moufang Planes.. Mathematische Zeitschrift, Tome 108 (1968), pp. 37-52. http://geodesic.mathdoc.fr/item/MZ_1968__108_171089/