1. 2Koo, B. H. Y. "A Meta-Language for Systems Architecting", PhD Thesis, Engineering Systems Division,Massachusetts InstituteofTechnology, January2005.
2. 3Simmons,W. L.,Koo,B.H.Y.,Crawley,E.F."MissionModeArchitectureGenerationforMoon-MarsExplorationUsing an ExecutableMeta-Language", AIAA-2005-6726, AIAA Space2005, August 30-September 1,2005.
3. 4Houbolt,J.C.,MannedLunarLandingthroughUseofLunarOrbitRendezvous,v1,TM-74736,NASA,1961.