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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Brzozowski, Janusz A. Hierarchies of aperiodic languages. Revue française d'automatique informatique recherche opérationnelle. Informatique théorique, Tome 10 (1976) no. R2, pp. 33-49. http://www.numdam.org/item/ITA_1976__10_2_33_0/

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