@article{ITA_2008__42_3_467_0,
     author = {Buls, J\={a}nis and Lorencs, Aivars},
     title = {From bi-ideals to periodicity},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {467--475},
     publisher = {EDP-Sciences},
     volume = {42},
     number = {3},
     year = {2008},
     doi = {10.1051/ita:2008010},
     mrnumber = {2434029},
     zbl = {1149.68410},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1051/ita:2008010/}
}