@article{10_2307_120975,
     author = {K.H. Kim and F.W. Roush},
     title = {The {Williams} conjecture is false for irreducible subshifts},
     journal = {Annals of mathematics},
     year = {1999},
     volume = {149},
     number = {2},
     doi = {10.2307/120975},
     zbl = {0989.37005},
     url = {http://geodesic.mathdoc.fr/articles/10.2307/120975/}
}