Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{CMUC_1977__18_3_a14, author = {Gardner, Barry J.}, title = {Ring varieties closed under ideal sums}, journal = {Commentationes Mathematicae Universitatis Carolinae}, pages = {569--578}, publisher = {mathdoc}, volume = {18}, number = {3}, year = {1977}, mrnumber = {0485628}, zbl = {0382.08007}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CMUC_1977__18_3_a14/} }
Gardner, Barry J. Ring varieties closed under ideal sums. Commentationes Mathematicae Universitatis Carolinae, Tome 18 (1977) no. 3, pp. 569-578. http://geodesic.mathdoc.fr/item/CMUC_1977__18_3_a14/