Geodesic
On projective Hjelmslev planes of level n
Glasgow mathematical journal, Tome 31 (1989) no. 3, pp. 257-261

Voir la notice de l'article provenant de la source Cambridge University Press

In this paper, we establish a new (but equivalent) definition of projective Hjelmslev planes of level n. This shows that the nth floor of a triangle building is a projective Hjelmslev plane of level n (a result already announced in [9], but left unproved). This will allow us to characterize Artmann-sequences by means of their inverse limits and to construct new ones. We also deduce a new existence theorem for level n projective Hjelmslev planes. All results hold in the finite as well as in the infinite case. 
Hanssens, G.; Maldeghem, H. van. On projective Hjelmslev planes of level n. Glasgow mathematical journal, Tome 31 (1989) no. 3, pp. 257-261. doi: 10.1017/S0017089500007837
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