1. NASA, NASA's Journeyto Mars,Pioneering NextStepsin SpaceExploration,2015.
2. Prater, T. J.,Bean, Q. A., Beshears, T. D., Rolin, T. D.,Werkheiser, N. J., Ordonez,E. A., Ryan, R. M., and Ledbetter III, F.E. "SummaryReport onPhaseI Resultsfromthe3DPrintingin Zero-GTechnologyDemonstrationMission,VolumeI (NASA/TP-2016-219101),"2016.