1. Knobloch, H.W.: Dichotomy and integral manifolds. Part I: General Principles. Resultate Mathe.
14 (1988), pp. 93–124.
2. Knobloch, H.W.: Stabilization of Control Systems by Means of High-Gain feedback. In: Optimal Control Theory and Economic Analysis 3, G. Feichtinger ed., North-Holland-Amsterdam, New York, Oxford, Tokyo, 1988. pp. 153–173.
3. Knobloch, H.W.: Invariant manifolds and singular perturbation. In: Proceedings of the eleventh international conference on nonlinear oscillations, M. Farkas, V. Kertész, G. Stépan eds. Janos Bolyai Mathematical Society, Budapest 1988. pp. 109–118.