Estimates for solutions to a class of nonlinear time-delay systems of neutral type

We consider nonlinear time-delay systems of neutral type with constant coefficients in the linear terms, $$ \frac{d}{dt}\big(y(t) + D y(t-\tau)\big) = A y(t) + B y(t-\tau) + F(t, y(t), y(t-\tau)). $$ We obtain estimates characterizing the exponential decay of solutions at infinity, and dependending on the norms of the powers of D