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@article{MZ_1968__107_171071, author = {F.D. Veldkamp and T.A. Springer}, title = {On {Hjelmslev-Moufang} {Planes.}}, journal = {Mathematische Zeitschrift}, pages = {249--263}, publisher = {mathdoc}, volume = {107}, year = {1968}, zbl = {0164.51301}, url = {http://geodesic.mathdoc.fr/item/MZ_1968__107_171071/} }
F.D. Veldkamp; T.A. Springer. On Hjelmslev-Moufang Planes.. Mathematische Zeitschrift, Tome 107 (1968), pp. 249-263. http://geodesic.mathdoc.fr/item/MZ_1968__107_171071/