no. R2
Hierarchies of aperiodic languages
Revue française d'automatique informatique recherche opérationnelle. Informatique théorique, Tome 10 (1976) no. R2, pp. 33-49 
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     title = {Hierarchies of aperiodic languages},
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     pages = {33--49},
     year = {1976},
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     address = {Paris},
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     number = {R2},
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     language = {en},
     url = {https://www.numdam.org/item/ITA_1976__10_2_33_0/}
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Brzozowski, Janusz A. Hierarchies of aperiodic languages. Revue française d'automatique informatique recherche opérationnelle. Informatique théorique, Tome 10 (1976) no. R2, pp. 33-49. https://www.numdam.org/item/ITA_1976__10_2_33_0/

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