no. 1
Separating words with machines and groups
RAIRO. Informatique théorique et applications, Tome 30 (1996) no. 1, pp. 81-86 
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     author = {Robson, J. M.},
     title = {Separating words with machines and groups},
     journal = {RAIRO. Informatique th\'eorique et applications},
     pages = {81--86},
     year = {1996},
     publisher = {EDP-Sciences},
     volume = {30},
     number = {1},
     mrnumber = {1398859},
     zbl = {0851.68076},
     language = {en},
     url = {https://www.numdam.org/item/ITA_1996__30_1_81_0/}
}
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Robson, J. M. Separating words with machines and groups. RAIRO. Informatique théorique et applications, Tome 30 (1996) no. 1, pp. 81-86. https://www.numdam.org/item/ITA_1996__30_1_81_0/

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3. J. M. Robson, Separating Strings with Small Automata, Information Processing Letters, 1989, 30, pp. 209-214. | Zbl | MR