1. The ACES stage concept: higher performance, new capabilities, at lower recurring cost;Barr,2015
2. Space Resource Economic Analysis Toolkit: the Case for Commercial Lunar Ice Mining;Blair,2002
3. Inside ULA’s Plan to Have 1,000 People Working in Space by 2045;David,2016
4. Space Transportation Architectures and Refueling for Lunar and Interplanetary Travel and Exploration (STARLITE);Diaz,2005