%0 Journal Article %A Pirillo, Giuseppe %T A hierarchy for circular codes %J RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications %D 2008 %P 717-728 %V 42 %N 4 %I EDP-Sciences %U http://www.numdam.org/articles/10.1051/ita:2008002/ %R 10.1051/ita:2008002 %G en %F ITA_2008__42_4_717_0