@article{10_4153_CMB_1983_048_6,
     author = {Lorimer, J. W.},
     title = {Dual {Numbers} and {Topological} {Hjelmslev} {Planes}},
     journal = {Canadian mathematical bulletin},
     pages = {297--302},
     year = {1983},
     volume = {26},
     number = {3},
     doi = {10.4153/CMB-1983-048-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1983-048-6/}
}