no. 3
From bi-ideals to periodicity
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 42 (2008) no. 3, pp. 467-475.

The necessary and sufficient conditions are extracted for periodicity of bi-ideals. They cover infinitely and finitely generated bi-ideals.

DOI : 10.1051/ita:2008010
Classification : 68R15, 94A55, 68Q15
Mots clés : periodic words, bi-ideals, the sequence generates the bi-ideal, finitely generated bi-ideals 
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Buls, Jānis; Lorencs, Aivars. From bi-ideals to periodicity. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 42 (2008) no. 3, pp. 467-475. doi : 10.1051/ita:2008010. http://archive.numdam.org/articles/10.1051/ita:2008010/

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