https://aeroastro.mit.edu/publications/r-furfaro-a-scorsoglio-r-linares-m-massari-adaptive-generalized-zem-zev-feedback-guidance-for-planetary-landing-via-a-deep-reinforcement-learning-approach-acta-astronautica-00945765-171-2/
R. Furfaro, A. Scorsoglio, R. Linares, M. Massari "Adaptive generalized ZEM-ZEV feedback guidance...