1. Moon refueling for interplanetary vehicles;Stehling;Aviation Age,1958
2. Rocket propellants from the moon;Cole;Astronautics and Aeronautics,1964
3. Manufacture of oxygen from lunar materials;Rosenberg;Ann. New York Academy of Sci.,1965
4. Economic implications of extracting propellants from the moon;Salkeld;J. Spacecraft,1966