@article{05668347,
title = {Covering a disk by disks.},
journal = {Beitr\"age zur Algebra und Geometrie},
volume = {51},
year = {2010},
pages = {91-109},
zbl = {1188.52003},
language = {en},
url = {http://dml.mathdoc.fr/item/05668347}
}
Dumitrescu, Adrian; Jiang, Minghui. Covering a disk by disks.. Beiträge zur Algebra und Geometrie, Tome 51 (2010) pp. 91-109. http://gdmltest.u-ga.fr/item/05668347/