@article{05191868,
title = {A staircase illumination theorem for orthogonal polygons.},
journal = {Beitr\"age zur Algebra und Geometrie},
volume = {48},
year = {2007},
pages = {309-320},
zbl = {1162.52002},
language = {en},
url = {http://dml.mathdoc.fr/item/05191868}
}
Breen, Marilyn. A staircase illumination theorem for orthogonal polygons.. Beiträge zur Algebra und Geometrie, Tome 48 (2007) pp. 309-320. http://gdmltest.u-ga.fr/item/05191868/