@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/