  This work is concerned with homogenization problems for elliptic equations of
the type \[ \begin{cases} \mathfrak{L}_{\delta} u_{\delta} + \lambda u_{\delta}
= f_{\delta} \qquad \text{in} \;\; D, \\ \qquad \quad \;\, u = 0 \qquad \,
\text{on} \;\; \partial D, \end{cases} \] where $\delta > 0$, $\lambda \in
\mathbb{R}$, $D$ is a bounded open set in $\mathbb{R}^{d}$, and $f_{\delta} \in
H^{-1}(D)$. The operator $ \mathfrak{L}_{\delta} u = -{\rm div} \left( A^\delta
\nabla u + C^\delta u \right) + B^\delta \nabla u +k^\delta u $ involved
uniformly bounded diffusion coefficients $A^\delta$, where drifts $B^\delta$,
$C^\delta$ and potential $k^\delta$ are possibly unbounded. An application to
homogenization of the corresponding diffusion processes is also discussed.
