no. 1
On subdirectly irreducible automata
RAIRO. Informatique théorique, Tome 15 (1981) no. 1, pp. 23-46 
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     author = {Demlov\'a, M. and Demel, J. and Koubek, V.},
     title = {On subdirectly irreducible automata},
     journal = {RAIRO. Informatique th\'eorique},
     pages = {23--46},
     year = {1981},
     publisher = {EDP Sciences},
     volume = {15},
     number = {1},
     mrnumber = {610944},
     zbl = {0482.68050},
     language = {en},
     url = {https://www.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. https://www.numdam.org/item/ITA_1981__15_1_23_0/

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