D. Briesenick, S. Walzer, and M. Liewald. Forming the Future, The Minerals, Metals & Materials Series, page 2585-2595. Springer Nature Switzerland AG, (2021)
T. Deliktas, A. Weiss, and M. Liewald. New Developments in Forging Technology, page 271-279. Stuttgart, Germany, Institute for Metal Foming Technologies, University of Stuttgart, (2019)