@article{JIS_2016__19_1_a0, author = {Birmajer, Daniel and Gil, Juan B. and Weiner, Michael D.}, title = {On the enumeration of restricted words over a finite alphabet}, journal = {Journal of integer sequences}, publisher = {mathdoc}, volume = {19}, number = {1}, year = {2016}, language = {en}, url = {http://geodesic.mathdoc.fr/item/JIS_2016__19_1_a0/} }