@article{01120246,
title = {Improved coverings of a square with six and eight equal circles.},
journal = {The Electronic Journal of Combinatorics [electronic only]},
volume = {3},
year = {1996},
zbl = {0889.52020},
language = {en},
url = {http://dml.mathdoc.fr/item/01120246}
}
Melissen, J.B.M.; Schuur, P.C. Improved coverings of a square with six and eight equal circles.. The Electronic Journal of Combinatorics [electronic only], Tome 3 (1996) . http://gdmltest.u-ga.fr/item/01120246/