@article{BAG_1986__22_138338,
     author = {K\'AROLY BEZDEK},
     title = {A remark about the directed line-elements in the plane},
     journal = {Beitr\"age zur Algebra und Geometrie},
     pages = {89--94},
     publisher = {mathdoc},
     volume = {22},
     year = {1986},
     zbl = {0607.52008},
     url = {http://geodesic.mathdoc.fr/item/BAG_1986__22_138338/}
}