@article{ITA_1991__25_4_305_0, author = {Madonia, M. and Salemi, S. and Sportelli, T.}, title = {On $z$-submonoids and $z$-codes}, journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications}, volume = {25}, year = {1991}, pages = {305-322}, mrnumber = {1134385}, zbl = {0764.68089}, language = {en}, url = {http://dml.mathdoc.fr/item/ITA_1991__25_4_305_0} }
Madonia, M.; Salemi, S.; Sportelli, T. On $z$-submonoids and $z$-codes. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 25 (1991) pp. 305-322. http://gdmltest.u-ga.fr/item/ITA_1991__25_4_305_0/
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