@article{10_4153_CMB_2004_033_2,
     author = {Drensky, Vesselin and Hammoudi, Lakhdar},
     title = {Combinatorics of {Words} and {Semigroup} {Algebras} {Which} {Are} {Sums} of {Locally} {Nilpotent} {Subalgebras}},
     journal = {Canadian mathematical bulletin},
     pages = {343--353},
     year = {2004},
     volume = {47},
     number = {3},
     doi = {10.4153/CMB-2004-033-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2004-033-2/}
}