@article{SLC_1983_07_a0,
     author = {Jean Berstel and Dominique Perrin},
     title = {Codes {Circulaires}},
     journal = {S\'eminaire lotharingien de combinatoire},
     year = {1983},
     volume = {07},
     url = {http://geodesic.mathdoc.fr/item/SLC_1983_07_a0/}
}