1. Human Landing System (HLS) Architecture Analyses of Alternatives, Design Analysis Cycle (DAC) 2, Attachment A-12,2019
2. Options for staging orbits in cislunar space;Whitley,2016
3. The Gateway power and propulsion element: setting the foundation for exploration and commerce;Ticker,2019
4. ISS Partners Endorse Modified Gateway Plans;Foust,2019
5. NASA to Sole Source Gateway Habitation Module to Northop Grumman;Foust,2019