Asymptotic expansion at infinity of solutions to Monge-Ampère equation with $C^{\alpha }$ right term

We develop a non-local method to establish the asymptotic expansion at infinity of solutions to Monge-Ampère equation $\det (D^{2}v)=f$ on $\text{rn}$, where $f$ is a perturbation of $1$ and is only assumed to be Hölder continuous outside a bounded subset of $\text{rn}$, compared to the previous work that $f$ is at least $C^2$.