@article{GDZPPN002361000, title = {Smash products, group actions and group graded rings.}, journal = {Mathematica Scandinavica}, volume = {69}, year = {1991}, pages = {161-170}, zbl = {0724.16020}, url = {http://dml.mathdoc.fr/item/GDZPPN002361000} }
Jondrup, Soren; Jensen, Anders. Smash products, group actions and group graded rings.. Mathematica Scandinavica, Tome 69 (1991) pp. 161-170. http://gdmltest.u-ga.fr/item/GDZPPN002361000/