Manobra orbital (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Manobra orbital" in Portuguese language version.

refsWebsite

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92^nd place

3^rd place

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741^st place

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low place

1^st place

archive.org

Walter Hohmann, The Attainability of Heavenly Bodies (Washington: NASA Technical Translation F-44, 1960) Internet Archive.
Belbruno, Edward (2007). Fly Me to the Moon: An Insider's Guide to the New Science of Space Travel. [S.l.]: Princeton University Press. pp. 176. ISBN 978-0-691-12822-1
W. E. Moeckel, Trajectories with Constant Tangential Thrust in Central Gravitational Fields, Technical Report R-63, NASA Lewis Research Center, 1960 (accessed 26 March 2014)

http://www2.jpl.nasa.gov/basics/bsf4-1.php Basics of Space Flight, Sec. 1 Ch. 4, NASA Jet Propulsion Laboratory