Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{COMIM_1996__4_1_a9, author = {Chvalina, Jan and Chvalinov\'a, Ludmila}, title = {State hypergroups of automata}, journal = {Communications in Mathematics}, pages = {105--119}, publisher = {mathdoc}, volume = {04}, number = {1}, year = {1996}, mrnumber = {1446788}, zbl = {0870.20053}, language = {en}, url = {http://geodesic.mathdoc.fr/item/COMIM_1996__4_1_a9/} }
Chvalina, Jan; Chvalinová, Ludmila. State hypergroups of automata. Communications in Mathematics, Tome 04 (1996) no. 1, pp. 105-119. http://geodesic.mathdoc.fr/item/COMIM_1996__4_1_a9/