R-4D (French Wikipedia)

Analysis of information sources in references of the Wikipedia article "R-4D" in French language version.

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apolloartifacts.com

(en) David Meerman Scott, « Marquardt R-4D Apollo spacecraft attitude control engine », Apollo Artifacts, novembre 2013 (consulté le 5 février 2016).

(en) Carl Stechman et Steve Harper, 46th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, The American Institute of Aeronautics and Astronautics, 2010 (ISBN 978-1-60086-958-7, DOI 10.2514/6.2010-6884), « Performance Improvements in Small Earth Storable Rocket Engines- An Era of Approaching the Theoretical ».