@article{10_4171_dm_328,
     author = {Rune Johansen},
     title = {On the structure of covers of sofic shifts},
     journal = {Documenta mathematica},
     pages = {111--131},
     year = {2011},
     volume = {16},
     doi = {10.4171/dm/328},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/dm/328/}
}