1. Design Considerations for the Surveyor Terminal Descent System;Cheng,1964
2. Terminal Guidance System for Soft Lunar Landing;Cheng,1962
3. Terminal Guidance and Control Techniques for Soft Lunar Landing;Kriegsman;ARS Journal,1962
4. Logarithmic Navigation for Precise Guidance of Space Vehicles;Green;IRE Transactions on Aerospace and Navigational Electronics,1961
5. Terminal Guidance Technique for Lunar Landing;Citron;AIAA Journal,1964