@article{02096236, title = {Unbounded regions in an arrangement of lines in the plane.}, journal = {Beitr\"age zur Algebra und Geometrie}, volume = {45}, year = {2004}, pages = {133-153}, zbl = {1061.52013}, language = {en}, url = {http://dml.mathdoc.fr/item/02096236} }
West, Alan. Unbounded regions in an arrangement of lines in the plane.. Beiträge zur Algebra und Geometrie, Tome 45 (2004) pp. 133-153. http://gdmltest.u-ga.fr/item/02096236/