1. Survey of numerical methods for trajectory optimization;Betts;Journal of guidance, control, and dynamics,1998
2. A review of optimization techniques in spacecraft flight trajectory design;Chai;Progress in aerospace sciences,2019
3. Optimisation of the terminal flight phase for a future reusable launch vehicle;Chartres,2005
4. Benchmark characterization for reusable launch vehicle onboard trajectory generation using a Legendre psuedospectral optimization method;Dyckman,2002
5. Direct trajectory optimization by a chebyshev pseudospectral method;Fahroo;Journal of Guidance, Control, and Dynamics,2002