@article{VM_1999_1_3_a2,
     author = {Michael Leyton},
     title = {Group {Theory} and {Architecture} 1:  {Nested} {Symmetries}},
     journal = {Visual Mathematics},
     publisher = {mathdoc},
     volume = {1},
     number = {3},
     year = {1999},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/VM_1999_1_3_a2/}
}