[ \mathbfM\ddot\mathbfu + \mathbfC\dot\mathbfu + \mathbfK\mathbfu = q_\infty \left( \mathbfA_0 \mathbfu + \mathbfA_1 \dot\mathbfu + \int_0^t \mathbfG(t-\tau)\dot\mathbfu(\tau) d\tau \right) ]
typically uses a loose staggering with sub-iterations: theoretical and computational aeroelasticity pdf
[ \mathbfK \mathbfu = q_\infty \mathbfA_0 \mathbfu ] theoretical and computational aeroelasticity pdf