@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/