1. Optimization of multistage rockets including drag;Adkins;J. Spacecraft,1970
2. Practical Methods for Optimal Control Using Nonlinear Programming;Betts,2001
3. Survey of numerical methods for trajectory optimization;Betts;J. Guidance, Control, and Dynamics,1998
4. Combined optimization of trajectory and stage separation of a hypersonic two-stage space vehicle;Bulirsch;Zeitschrift für Flugwissenschaften und Weltraumforschung,1995
5. Optimum staging of multistage rockets;Burghes;J. Mathematical Education in Science and Technology,1974