@article{GDZPPN000362980,
title = {Can You Cover Your Shadows?},
journal = {Discrete \& computational geometry},
volume = {1},
year = {1986},
pages = {45-58},
zbl = {0593.52002},
url = {http://dml.mathdoc.fr/item/GDZPPN000362980}
}
Mani-Levitska, P.; Debrunner, H.E. Can You Cover Your Shadows?. Discrete & computational geometry, Tome 1 (1986) pp. 45-58. http://gdmltest.u-ga.fr/item/GDZPPN000362980/