Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{KYB_1968__4_6_a1, author = {Havel, Ivan M.}, title = {Regular expressions over generalized alphabet and design of logical nets}, journal = {Kybernetika}, pages = {--537}, publisher = {mathdoc}, volume = {04}, number = {6}, year = {1968}, mrnumber = {0247956}, zbl = {0169.31504}, language = {en}, url = {http://geodesic.mathdoc.fr/item/KYB_1968__4_6_a1/} }
Havel, Ivan M. Regular expressions over generalized alphabet and design of logical nets. Kybernetika, Tome 04 (1968) no. 6, p. 537. http://geodesic.mathdoc.fr/item/KYB_1968__4_6_a1/