Magic N-cubes form a free monoid.
Adler, Allan
The Electronic Journal of Combinatorics [electronic only], Tome 4 (1997), / Harvested from The Electronic Library of Mathematics
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Publié le : 1997-01-01
EUDML-ID : urn:eudml:doc:119231 
@article{01118000,
     title = {Magic },
     journal = {The Electronic Journal of Combinatorics [electronic only]},
     volume = {4},
     year = {1997},
     zbl = {0885.05007},
     language = {en},
     url = {http://dml.mathdoc.fr/item/01118000}
}

Adler, Allan. Magic . The Electronic Journal of Combinatorics [electronic only], Tome 4 (1997) . http://gdmltest.u-ga.fr/item/01118000/