@article{GDZPPN00036729X,
title = {Covering the Plane with Two Kinds of Circles.},
journal = {Discrete \& computational geometry},
volume = {13},
year = {1995},
pages = {445-458},
zbl = {0830.52009},
url = {http://dml.mathdoc.fr/item/GDZPPN00036729X}
}
Tóth, Fejes G. Covering the Plane with Two Kinds of Circles.. Discrete & computational geometry, Tome 13 (1995) pp. 445-458. http://gdmltest.u-ga.fr/item/GDZPPN00036729X/