@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/