Under CopyrightLang, H.H.LangBitsch, G.G.BitschDreßler, K.K.DreßlerSpeckert, M.M.Speckert2022-03-0717.11.20062006https://publica.fraunhofer.de/handle/publica/29304210.24406/publica-fhg-2930421 Introduction S.1 2 The stop and the play operator S.2-4 3 The two boundary value problems S.5-7 4 Solution of both problems S.8-13 5 Comparison S.14-19 References S.20-21 Published reports of the Fraunhofer ITWM S.22-31en519003006report