COHEN M, MONTGOMERY S. Group-graded rings, Smash products, and group actions [J]. Transactions of the American Mathematical Society, 1984.237-258.
[2]
N?ST?SESCUC, RAIANU S, VAN OYSTAEYEN F. Modules graded by G-sets [J]. Math, 1990(4):605-627.
[3]
CIBILS C, EDUARDO N M. Skew category, Galois covering and Smash product of a k-category [J]. Proceedings of the American Mathematical Society, 2006(1):39-50.doi:10.1090/S0002-9939-05-07955-4.
[4]
ABRAMS G, MENINI C, DELRIO A. Realization theorems for catgories of graded modules over semigroup-graded rings [J]. Communications in Algebra, 1994, (13):5343-5388.
[5]
BEATTIE M. A generalization of the Smash product of a graded ring [J]. Journal of Pure and Applied Algebra, 1988(3):219-229.
[6]
LIU Shao-xue, VAN OYSTAEYEN F. Group graded rings, Smash product and additive categories, in perspective in ring theory [M]. Kluwer Academic Publishers, 1998.299-310.