@article{DMTCS_2016_18_3_a4,
     author = {Cooper, Joshua and Rorabaugh, Danny},
     title = {Asymptotic {Density} of {Zimin} {Words}},
     journal = {Discrete mathematics & theoretical computer science},
     publisher = {mathdoc},
     volume = {18},
     number = {3},
     year = {2015-2016},
     doi = {10.46298/dmtcs.1302},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.46298/dmtcs.1302/}
}