  We establish existence and pointwise estimates of fundamental solutions and
Green's matrices for divergence form, second order strongly elliptic systems in
a domain $\Omega \subseteq \mathbb{R}^n$, $n \geq 3$, under the assumption that
solutions of the system satisfy De Giorgi-Nash type local H\"{o}lder continuity
estimates. In particular, our results apply to perturbations of diagonal
systems, and thus especially to complex perturbations of a single real
equation.
