Geodesic
Normal cyclotomic schemes over a finite commutative ring
Algebra i analiz, Tome 19 (2007) no. 6, pp. 59-85.

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Cyclotomic association schemes over a finite commutative ring $R$ with identity are studied. The main goal is to identify the normal cyclotomic schemes $\mathcal{C}$, i.e., those for which $\operatorname{Aut}(\mathcal{C})\le A\Gamma L_1(R)$. The problem reduces to the case where the ring $R$ is local, and in this case a necessary condition of normality in terms of the subgroup of $R^\times$ that determines $\mathcal{C}$ is given. This condition is proved to be sufficient for a large class of local rings including the Galois rings of odd characteristic.
Keywords: Association scheme, cyclotomic schemes. 
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S. A. Evdokimov; I. N. Ponomarenko. Normal cyclotomic schemes over a finite commutative ring. Algebra i analiz, Tome 19 (2007) no. 6, pp. 59-85. http://geodesic.mathdoc.fr/item/AA_2007_19_6_a2/

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