@article{JIS_2016__19_6_a5,
     author = {Sollami, Michael and Douglas, Craig C. and Liebmann, Manfred},
     title = {An improved lower bound on the number of ternary squarefree words},
     journal = {Journal of integer sequences},
     publisher = {mathdoc},
     volume = {19},
     number = {6},
     year = {2016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2016__19_6_a5/}
}