@article{DM_2001_13_1_a5,
     author = {I. N. Landjev and T. Khonol'd},
     title = {Arcs in projective {Hjelmslev} planes},
     journal = {Diskretnaya Matematika},
     pages = {90--109},
     publisher = {mathdoc},
     volume = {13},
     number = {1},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_2001_13_1_a5/}
}