@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/