The necessary and sufficient conditions are extracted for periodicity of bi-ideals. They cover infinitely and finitely generated bi-ideals.
@article{ITA_2008__42_3_467_0, author = {Buls, J\=anis and Lorencs, Aivars}, title = {From bi-ideals to periodicity}, journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications}, volume = {42}, year = {2008}, pages = {467-475}, doi = {10.1051/ita:2008010}, mrnumber = {2434029}, zbl = {1149.68410}, language = {en}, url = {http://dml.mathdoc.fr/item/ITA_2008__42_3_467_0} }
Buls, Jānis; Lorencs, Aivars. From bi-ideals to periodicity. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 42 (2008) pp. 467-475. doi : 10.1051/ita:2008010. http://gdmltest.u-ga.fr/item/ITA_2008__42_3_467_0/
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