@article{VM_1999_1_1_a4, author = {Peter Hilton and Jean Pedersen}, title = {Symmetry in {Practice} - {Recreational} {Constructions}}, journal = {Visual Mathematics}, publisher = {mathdoc}, volume = {1}, number = {1}, year = {1999}, url = {http://geodesic.mathdoc.fr/item/VM_1999_1_1_a4/} }