@article{DCG_1986__1_130980,
     author = {P. Mani-Levitska and H.E. Debrunner},
     title = {Can {You} {Cover} {Your} {Shadows?}},
     journal = {Discrete & computational geometry},
     pages = {45--58},
     publisher = {mathdoc},
     volume = {1},
     year = {1986},
     zbl = {0593.52002},
     url = {http://geodesic.mathdoc.fr/item/DCG_1986__1_130980/}
}