Geodesic
On the coefficient ring in a~semigroup ring
Izvestiya. Mathematics , Tome 10 (1976) no. 5, pp. 899-911.

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In this paper we study the concept of the invariance of a ring relative to a commutative semigroup. Invariance is proved for certain Prüfer rings and affine algebras relative to semigroups of a special class. Bibliography: 11 titles. 
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S. G. Vlăduţ. On the coefficient ring in a~semigroup ring. Izvestiya. Mathematics , Tome 10 (1976) no. 5, pp. 899-911. http://geodesic.mathdoc.fr/item/IM2_1976_10_5_a0/

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