@article{ITA_2008__42_3_481_0,
     author = {Chaubard, Laura and Costa, Alfredo},
     title = {A new algebraic invariant for weak equivalence of sofic subshifts},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {481--502},
     publisher = {EDP-Sciences},
     volume = {42},
     number = {3},
     year = {2008},
     doi = {10.1051/ita:2008015},
     mrnumber = {2434031},
     zbl = {1155.37009},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1051/ita:2008015/}
}