@article{ITA_1981__15_1_23_0,
     author = {Demlov\'a, M. and Demel, J. and Koubek, V.},
     title = {On subdirectly irreducible automata},
     journal = {RAIRO. Informatique th\'eorique},
     pages = {23--46},
     publisher = {EDP-Sciences},
     volume = {15},
     number = {1},
     year = {1981},
     mrnumber = {610944},
     zbl = {0482.68050},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1981__15_1_23_0/}
}