@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/