1. BATTIN, R.H. An Introduction to the Mathematics and Methods of Astrodynamics, AIAA Education Series, American Institute of Aeronautics and Astronautics, Inc., 1633 Broadway, New York, NY 10019, 1987.
2. BETTS, J. T. “Optimal Three-Burn Orbit Transfer,” AIAA Journal, Vol. 15, No. 6, 1977, pp. 861–864.
3. Practical Methods for Optimal Control using Nonlinear Programming, Society for Industrial and Applied Mathematics, Philadelphia, PA., 2001.
4. BETTS, J. T., ELDERSVELD, S. K., FRANK, P. D., and LEWIS, J.G. “An Interior-Point Nonlinear Programming Algorithm for Very Large Scale Optimization,” in Large-Scale PDEConstrained Optimization, L. T. Biegler, O. Ghattas, M. Heinkenschloss, and B. van Bloemen Waanders, eds., Springer-Verlag, Berlin, 2003, pp. 184–198.
5. BETTS, J. T. and FRANK, P. D. “A Sparse Nonlinear Optimization Algorithm,” Journal of Optimization Theory and Applications, Vol. 82, No. 3, 1994, pp. 519–541.