@article{MZ_1980__174_173011,
     author = {Everett C. Dade},
     title = {Group-Graded {Rings} and {Modules.}},
     journal = {Mathematische Zeitschrift},
     pages = {241--262},
     publisher = {mathdoc},
     volume = {174},
     year = {1980},
     zbl = {0424.16001},
     url = {http://geodesic.mathdoc.fr/item/MZ_1980__174_173011/}
}