no. 1
Hierarchies of aperiodic languages
Séminaire Dubreil. Algèbre et théorie des nombres, Tome 28 (1974-1975) no. 1, Exposé no. 19, 11 p. 
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Brzozowski, Janusz A. Hierarchies of aperiodic languages. Séminaire Dubreil. Algèbre et théorie des nombres, Tome 28 (1974-1975) no. 1, Exposé no. 19, 11 p. http://www.numdam.org/item/SD_1974-1975__28_1_A13_0/

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