@article{10_37236_1240,
     author = {R. L. Graham and B. D. Lubachevsky},
     title = {Repeated patterns of dense packings of equal disks in a square},
     journal = {The electronic journal of combinatorics},
     year = {1996},
     volume = {3},
     number = {1},
     doi = {10.37236/1240},
     zbl = {0851.05038},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1240/}
}