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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/
@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},
year = {1977},
volume = {18},
number = {3},
mrnumber = {0485628},
zbl = {0382.08007},
language = {en},
url = {http://geodesic.mathdoc.fr/item/CMUC_1977_18_3_a14/}
}
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