Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{SF_1981__23_134511, author = {D. Helmer}, title = {Continuity of semigroup actions.}, journal = {Semigroup forum}, pages = {153--189}, publisher = {mathdoc}, volume = {23}, year = {1981}, zbl = {0473.22002}, url = {http://geodesic.mathdoc.fr/item/SF_1981__23_134511/} }
D. Helmer. Continuity of semigroup actions.. Semigroup forum, Tome 23 (1981), pp. 153-189. http://geodesic.mathdoc.fr/item/SF_1981__23_134511/