@article{1255455261,
author = {Kleinfeld, Erwin},
title = {Finite Hjelmslev planes},
journal = {Illinois J. Math.},
volume = {3},
number = {1},
year = {1959},
pages = { 403-407},
language = {en},
url = {http://dml.mathdoc.fr/item/1255455261}
}
Kleinfeld, Erwin. Finite Hjelmslev planes. Illinois J. Math., Tome 3 (1959) no. 1, pp. 403-407. http://gdmltest.u-ga.fr/item/1255455261/