@article{00702460,
title = {Covering the plane with congruent copies of a convex disk.},
journal = {Beitr\"age zur Algebra und Geometrie},
volume = {35},
year = {1994},
pages = {101-108},
zbl = {0806.52014},
language = {en},
url = {http://dml.mathdoc.fr/item/00702460}
}
Smith, Edwin. Covering the plane with congruent copies of a convex disk.. Beiträge zur Algebra und Geometrie, Tome 35 (1994) pp. 101-108. http://gdmltest.u-ga.fr/item/00702460/