@article{10_21136_CMJ_1969_100909,
     author = {Higgins, John C.},
     title = {A faithful canonical representation for finitely generated $N$-semigroups},
     journal = {Czechoslovak Mathematical Journal},
     pages = {375--379},
     publisher = {mathdoc},
     volume = {19},
     number = {3},
     year = {1969},
     doi = {10.21136/CMJ.1969.100909},
     mrnumber = {0248251},
     zbl = {0183.30602},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1969.100909/}
}