@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},
     year = {2016},
     volume = {19},
     number = {1},
     zbl = {1329.05011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2016__19_1_a0/}
}