Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{DCG_1990__5_2_131102, author = {N.J.A. Sloane and R.L. Graham}, title = {Penny-Packing and {Two-Dimensional} {Codes.}}, journal = {Discrete & computational geometry}, pages = {1--12}, publisher = {mathdoc}, volume = {5}, number = {2}, year = {1990}, zbl = {0686.52010}, url = {http://geodesic.mathdoc.fr/item/DCG_1990__5_2_131102/} }
N.J.A. Sloane; R.L. Graham. Penny-Packing and Two-Dimensional Codes.. Discrete & computational geometry, Tome 5 (1990) no. 2, pp. 1-12. http://geodesic.mathdoc.fr/item/DCG_1990__5_2_131102/