1. and , Applied Optimal Control, Ginn and Company, Waltham, Massachusetts, 1969.
2. ‘Die Mehrzielmethode zur numerischen Lösung von nichtlinearen Randwertproblemen und Aufgaben der optimalen Steuerung’, Report der Carl-Cranz-Gesellschaft, 1971.
3. and , ‘Numerical solution of nonlinear two-point boundary value problems I’, to be published in Handbook Series Approximation, Numer. Math.
4. A modified continuation method for the numerical solution of nonlinear two-point boundary value problems by shooting techniques
5. ‘Instationary dolphin flight: the optimal energy exchange between a sailplane and vertical currents in the atmosphere’, Memorandum COSOR 80-12, Department of Mathematics, Eindhoven University of Technology, 1980.