@article{01505615,
title = {On a covering problem in the plane.},
journal = {Beitr\"age zur Algebra und Geometrie},
volume = {41},
year = {2000},
pages = {425-426},
zbl = {0976.52002},
language = {en},
url = {http://dml.mathdoc.fr/item/01505615}
}
Weißbach, Bernulf. On a covering problem in the plane.. Beiträge zur Algebra und Geometrie, Tome 41 (2000) pp. 425-426. http://gdmltest.u-ga.fr/item/01505615/