@article{VM_2004_6_4_a4,
     author = {Ricardo Zalaya and Javier Barrallo},
     title = {Classification of {Mathematical} {Sculpture}},
     journal = {Visual Mathematics},
     publisher = {mathdoc},
     volume = {6},
     number = {4},
     year = {2004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/VM_2004_6_4_a4/}
}