Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{SF_1976__13_134203, author = {E. Valkema}, title = {Syntaktische {Monoide} und {Hypercodes.}}, journal = {Semigroup forum}, pages = {119--126}, publisher = {mathdoc}, volume = {13}, year = {1976}, language = {de}, url = {http://geodesic.mathdoc.fr/item/SF_1976__13_134203/} }
E. Valkema. Syntaktische Monoide und Hypercodes.. Semigroup forum, Tome 13 (1976), pp. 119-126. http://geodesic.mathdoc.fr/item/SF_1976__13_134203/