no. 1
On finitely generated monoids of matrices with entries in ℕ
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 25 (1991) no. 1, pp. 19-38. 
@article{ITA_1991__25_1_19_0,
     author = {Weber, Andreas and Seidl, Helmut},
     title = {On finitely generated monoids of matrices with entries in $\mathbb {N}$},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {19--38},
     publisher = {EDP-Sciences},
     volume = {25},
     number = {1},
     year = {1991},
     mrnumber = {1104408},
     zbl = {0721.20042},
     language = {en},
     url = {http://archive.numdam.org/item/ITA_1991__25_1_19_0/}
}
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Weber, Andreas; Seidl, Helmut. On finitely generated monoids of matrices with entries in $\mathbb {N}$. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 25 (1991) no. 1, pp. 19-38. http://archive.numdam.org/item/ITA_1991__25_1_19_0/

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