National Aeronautic and Atmospheric Administration's GlennResearchCenter. Gas Density GlennresearchCenter. grc.nasa.gov. [2015-08-29]. (原始内容存档于2013-04-14)
GlennResearchCenter (页面存档备份,存于互联网档案馆) (includes Centaur orbiter mission) Scott W. Benson – Solar Power for Outer Planets Study (2007) – NASA Glenn Research