1. and A multiple shooting algorithm for direct solution of optimal control problems. In J. Gertler, editor, Proc. 9th IFAC World Congress, Budapest, Hungary, 1984, volume IX, pages 242-247, Oxford, UK, 1985. Pergamon Press.
2. and Optimal dimensioning of pipe networks with application to gas transmission networks. Oper. Res., 44(4):596- 608, 1997.
3. and Nonlinear optimization in gas networks. ZIB Report ZR-03-46, Konrad-Zuse-Zentrum für Informationstechnik Berlin, 2003.
4. Integrierte Betriebsplanung von Gasversorgungssystemen. Verlag Mainz, Wissenschaftsverlag, Aachen, 2002.
5. and Cutting planes for the optimization of gas networks. Preprint 2253, Fachbereich Mathematik, Technische Universität Darmstadt, 2002.