@article{VM_2001_3_2_a10,
     author = {Charles Perry},
     title = {Continuum broken symmetry and more},
     journal = {Visual Mathematics},
     publisher = {mathdoc},
     volume = {3},
     number = {2},
     year = {2001},
     url = {http://geodesic.mathdoc.fr/item/VM_2001_3_2_a10/}
}