1. National Aeronautics and Space Administration FY 2015 President’s Budget Request Summary, 2014.
2. United States Air Force Fiscal Year 2015 Budget Overview, 2014.
3. A novel system for space flight using a propulsive fluid accumulator;Demetriades;J. Br. Interplanet. Soc.,1959
4. S.T. Demetriades C. Kretschmer, The Use of Planetary Atmospheres for Propulsion, United States Air Force, Office of Scientific Research, 1958
5. Preliminary study of propulsive fluid accumulator;Demetriades;J. Br. Interplanet. Soc.,1962