@article{GDZPPN00036309X,
title = {Some Basic Properties of Packing and Covering Constants.},
journal = {Discrete \& computational geometry},
volume = {1},
year = {1986},
pages = {183-193},
zbl = {0599.52006},
url = {http://dml.mathdoc.fr/item/GDZPPN00036309X}
}
Groemer, H. Some Basic Properties of Packing and Covering Constants.. Discrete & computational geometry, Tome 1 (1986) pp. 183-193. http://gdmltest.u-ga.fr/item/GDZPPN00036309X/