Heppenheimer, Thomas A. (July–August 1978). "A mass-catcher for large-scale lunar material transport". Journal of Spacecraft and Rockets. 15 (4): 242–249. Bibcode:1978JSpRo..15..242H. doi:10.2514/3.28009.
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Heppenheimer, Thomas A. (July–August 1978). "A mass-catcher for large-scale lunar material transport". Journal of Spacecraft and Rockets. 15 (4): 242–249. Bibcode:1978JSpRo..15..242H. doi:10.2514/3.28009.