@inproceedings{bridges2011:403, author = {Chaves, Manuel Arala}, title = {Good Stamps for Wallpaper Patterns}, pages = {403--410}, booktitle = {Proceedings of Bridges 2011: Mathematics, Music, Art, Architecture, Culture}, year = {2011}, editor = {Sarhangi, Reza and S\'{e}quin, Carlo H.}, isbn = {978-0-9846042-6-5}, issn = {1099-6702}, publisher = {Tessellations Publishing}, address = {Phoenix, Arizona}, url = {http://archive.bridgesmathart.org/2011/bridges2011-403.html} }