On subdirectly irreducible automata
RAIRO. Informatique théorique, Tome 15 (1981) no. 1, pp. 23-46. 
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     url = {http://archive.numdam.org/item/ITA_1981__15_1_23_0/}
}
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Demlová, M.; Demel, J.; Koubek, V. On subdirectly irreducible automata. RAIRO. Informatique théorique, Tome 15 (1981) no. 1, pp. 23-46. http://archive.numdam.org/item/ITA_1981__15_1_23_0/

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