@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/