Group graded rings and smash products
Rendiconti del Seminario Matematico della Università di Padova, Tome 74 (1985), pp. 129-137. 
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     author = {N\u{a}st\u{a}sescu, C. and Rodin\`o, N.},
     title = {Group graded rings and smash products},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {129--137},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {74},
     year = {1985},
     mrnumber = {818722},
     zbl = {0602.16002},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1985__74__129_0/}
}
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Năstăsescu, C.; Rodinò, N. Group graded rings and smash products. Rendiconti del Seminario Matematico della Università di Padova, Tome 74 (1985), pp. 129-137. http://www.numdam.org/item/RSMUP_1985__74__129_0/

[1] M. Cohen - S. Montgomery, Group-Graded Rings, Smash Product and Group Actions, Trans. Am. Math. Soc., 282, no. 1 (1984), pp. 237-258. | MR | Zbl

[2] C. N - F. Van Oystaeyen, Graded Ring Theory, North-Holland, Math. Library, Vol. 28 (1982). | MR | Zbl

[3] Bo Stenström, Rings of Quotients, Springer-Verlag, Berlin, 1975. | MR | Zbl