https://khazna.ku.ac.ae/en/courses/advanced-orbit-design-for-planetary-missions/
Advanced Orbit Design for Planetary Missions - Khalifa University
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https://www.rand.org/pubs/papers/P3364.html
The Soviet planetary missions | RAND
An examination of the Soviet planetary program in the light of recently released material on the Venus 2 and 3 flights. The information clarifies the Soviet...
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