Geodesic
Recent results and open questions on semigroup graded rings
Fundamentalʹnaâ i prikladnaâ matematika, Tome 4 (1998) no. 4, pp. 1115-1139.

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The survey is devoted to the main results obtained recently in the theory of semigroup graded rings. It contains several open questions motivated by the results of various authors. 
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     author = {A. V. Kelarev},
     title = {Recent results and open questions on semigroup graded rings},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {1115--1139},
     publisher = {mathdoc},
     volume = {4},
     number = {4},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_1998_4_4_a0/}
}
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A. V. Kelarev. Recent results and open questions on semigroup graded rings. Fundamentalʹnaâ i prikladnaâ matematika, Tome 4 (1998) no. 4, pp. 1115-1139. http://geodesic.mathdoc.fr/item/FPM_1998_4_4_a0/