@article{10_37236_1524,
     author = {David W. Boll and Jerry Donovan and Ronald L. Graham and Boris D. Lubachevsky},
     title = {Improving dense packings of equal disks in a square},
     journal = {The electronic journal of combinatorics},
     year = {2000},
     volume = {7},
     doi = {10.37236/1524},
     zbl = {0962.52004},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1524/}
}