@article{GDZPPN002424231, title = {Group-Graded Rings and Modules.}, journal = {Mathematische Zeitschrift}, volume = {174}, year = {1980}, pages = {241-262}, zbl = {0424.16001}, url = {http://dml.mathdoc.fr/item/GDZPPN002424231} }
Dade, Everett C. Group-Graded Rings and Modules.. Mathematische Zeitschrift, Tome 174 (1980) pp. 241-262. http://gdmltest.u-ga.fr/item/GDZPPN002424231/