Let $R$ be a finite commutative principal ideal ring with unity. In this article, we prove that the zero-divisor graph $\Gamma(R)$ is a divisor graph if and only if $R$ is a local ring or it is a product of two local rings with at least one of them having diameter less than $2$. We also prove that $\Gamma(R)$ is a divisor graph if and only if $\Gamma(R[x])$ is a divisor graph if and only if $\Gamma(R[[x]])$ is a divisor graph.
OSBA, EMAD ABU and ALKAM, OSAMA
"When zero-divisor graphs are divisor graphs,"
Turkish Journal of Mathematics: Vol. 41:
4, Article 3.
Available at: https://journals.tubitak.gov.tr/math/vol41/iss4/3