Variable-Time-Domain Neighboring Optimal Guidance, Part 1: Algorithm Structure. - Mauro Pontani; Giampaolo Cecchetti; Paolo Teofilatto (J. Optim. Theory Appl., 2015)

Variable-Time-Domain Neighboring Optimal Guidance, Part 2: Application to Lunar Descent and Soft Landing. - Mauro Pontani; Giampaolo Cecchetti; Paolo Teofilatto (J. Optim. Theory Appl., 2015)