@article{VM_2003_5_4_a2,
     author = {William C. Hoffman},
     title = {Symmetry in {Psychology}},
     journal = {Visual Mathematics},
     year = {2003},
     volume = {5},
     number = {4},
     url = {http://geodesic.mathdoc.fr/item/VM_2003_5_4_a2/}
}