@article{VM_2004_6_4_a2,
     author = {John Pais and Richard Singer},
     title = {Visual {Magic} {Squares} and {Group} {Orbits} {I}},
     journal = {Visual Mathematics},
     publisher = {mathdoc},
     volume = {6},
     number = {4},
     year = {2004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/VM_2004_6_4_a2/}
}