@article{CM_1989__71_3_285_0, author = {Hanssens, G. and Van Maldeghem, H.}, title = {A universal construction for projective Hjelmslev planes of level $n$}, journal = {Compositio Mathematica}, volume = {72}, year = {1989}, pages = {285-294}, mrnumber = {1022046}, zbl = {0709.51010}, language = {en}, url = {http://dml.mathdoc.fr/item/CM_1989__71_3_285_0} }
Hanssens, G.; Van Maldeghem, H. A universal construction for projective Hjelmslev planes of level $n$. Compositio Mathematica, Tome 72 (1989) pp. 285-294. http://gdmltest.u-ga.fr/item/CM_1989__71_3_285_0/
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