@article{CTGDC_1973__14_2_143_0, author = {Ribenboim, Paulo}, title = {The differential spectrum of a ring}, journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques}, volume = {14}, year = {1973}, pages = {143-152}, mrnumber = {330165}, zbl = {0273.13002}, language = {en}, url = {http://dml.mathdoc.fr/item/CTGDC_1973__14_2_143_0} }
Ribenboim, Paulo. The differential spectrum of a ring. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 14 (1973) pp. 143-152. http://gdmltest.u-ga.fr/item/CTGDC_1973__14_2_143_0/
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