@article{01522355,
title = {Improving dense packings of equal disks in a square.},
journal = {The Electronic Journal of Combinatorics [electronic only]},
volume = {7},
year = {2000},
zbl = {0962.52004},
language = {en},
url = {http://dml.mathdoc.fr/item/01522355}
}
Boll, W.David; Donovan, Jerry; Graham, Ronald L.; Lubachevsky, Boris D. Improving dense packings of equal disks in a square.. The Electronic Journal of Combinatorics [electronic only], Tome 7 (2000) . http://gdmltest.u-ga.fr/item/01522355/