@article{VM_2007_9_4_a0,
     author = {Claudio F. Guerri and Denes Nagy},
     title = {6 {Th} {National} {Congress} and 3 {Rd} {International} {Congress} of {Sema} 7 {Th} {Interdisciplinary} {Symmetry} {Congress} and {Exhibition} of {Isis-symmetry}},
     journal = {Visual Mathematics},
     publisher = {mathdoc},
     volume = {9},
     number = {4},
     year = {2007},
     url = {http://geodesic.mathdoc.fr/item/VM_2007_9_4_a0/}
}