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References
Hohmann, “Die Erreichbarkeit der Himmelskörper” (Oldenbourg, Berlin, 1925).
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HUMPHRIES, J. Third International Congress on Astronautics. Nature 170, 1053–1054 (1952). https://doi.org/10.1038/1701053a0
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DOI: https://doi.org/10.1038/1701053a0