Svoboda, Z.
(Нелінійні коливання, 2016)
We derive representations for solutions to initial-value problems for n-dimensional second-order differential equations with delays,
x''(t) = 2Ax' (t − τ ) − (A² + B² )x(t − 2τ),
and
x''(t) = (A + B)x' (t − τ ) − ...