1. 4Griffin, J., NASA-JSC ORS (Orbital Refueling System) Experiment, NASA/USAF Interchange on Spacecraft Maintenance, October 1-2, 1985.
2. 5Propellant Transfer Subsystem (PTS) Engineering Critical Design Review (eCDR), RL-PTS-REVW-0201, July 18-19, 2019 (EAR 9E515 / ITAR protected, requiring US company requests through GSFC NExIS technologies office for release of redacted copy without any supporting company proprietary information).