The general Sombor index of $G$ is defined as $SO_α(G)= \sum_{uv\in G}\left(d^2_{G}(u)+d^2_{G}(v)\right)^α$. For $0<α<1$, we have the upper bound of $SO_α(G)$ on unicyclic graphs with a fixed diameter, and the extremal graph is also characterized.
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