@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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