@article{VM_2007_9_4_a1,
     author = {Michael Burt},
     title = {Periodic {Sponge} {Surfaces} and {Uniform} {Sponge} {Polyhedra} in {Nature} and in the {Realm} of the {Theoretically} {Imaginable}},
     journal = {Visual Mathematics},
     publisher = {mathdoc},
     volume = {9},
     number = {4},
     year = {2007},
     url = {http://geodesic.mathdoc.fr/item/VM_2007_9_4_a1/}
}