@article{GDZPPN000364576,
title = {Convex Disks Can Cover Their Shadow.},
journal = {Discrete \& computational geometry},
volume = {5},
year = {1990},
pages = {529-532},
zbl = {0712.52003},
url = {http://dml.mathdoc.fr/item/GDZPPN000364576}
}
Kós, G.; Töröcsik, J. Convex Disks Can Cover Their Shadow.. Discrete & computational geometry, Tome 5 (1990) pp. 529-532. http://gdmltest.u-ga.fr/item/GDZPPN000364576/