@article{10_37236_1300,
     author = {Allan Adler},
     title = {Magic {\(N\)-cubes} form a free monoid},
     journal = {The electronic journal of combinatorics},
     year = {1997},
     volume = {4},
     number = {1},
     doi = {10.37236/1300},
     zbl = {0885.05007},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1300/}
}