no. 3
The topologies of sofic subshifts have computable Pierce invariants
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 25 (1991) no. 3, pp. 247-254. 
@article{ITA_1991__25_3_247_0,
     author = {Head, Tom},
     title = {The topologies of sofic subshifts have computable {Pierce} invariants},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {247--254},
     publisher = {EDP-Sciences},
     volume = {25},
     number = {3},
     year = {1991},
     mrnumber = {1119043},
     zbl = {0734.68058},
     language = {en},
     url = {http://archive.numdam.org/item/ITA_1991__25_3_247_0/}
}
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Head, Tom. The topologies of sofic subshifts have computable Pierce invariants. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 25 (1991) no. 3, pp. 247-254. http://archive.numdam.org/item/ITA_1991__25_3_247_0/

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