Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{SF_1980__21_134444, author = {D. Helmer}, title = {Joint continuity of affine semigroup actions.}, journal = {Semigroup forum}, pages = {153--166}, publisher = {mathdoc}, volume = {21}, year = {1980}, zbl = {0447.22001}, url = {http://geodesic.mathdoc.fr/item/SF_1980__21_134444/} }
D. Helmer. Joint continuity of affine semigroup actions.. Semigroup forum, Tome 21 (1980), pp. 153-166. http://geodesic.mathdoc.fr/item/SF_1980__21_134444/