no. 1
Hotz-isomorphism theorems in formal language theory
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 23 (1989) no. 1, pp. 29-43. 
@article{ITA_1989__23_1_29_0,
     author = {Diekert, Volker and M\"obus, Axel},
     title = {Hotz-isomorphism theorems in formal language theory},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {29--43},
     publisher = {EDP-Sciences},
     volume = {23},
     number = {1},
     year = {1989},
     mrnumber = {990066},
     zbl = {0665.68059},
     language = {en},
     url = {http://archive.numdam.org/item/ITA_1989__23_1_29_0/}
}
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Diekert, Volker; Möbus, Axel. Hotz-isomorphism theorems in formal language theory. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 23 (1989) no. 1, pp. 29-43. http://archive.numdam.org/item/ITA_1989__23_1_29_0/

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