@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/