1. Noeggerath, W., private communication.
2. “Vergleichsbetrachtungen und Treibstofffragen bei R-Antreiben,”;Lutz;Akademie fur Luftfahrtforschungen,1943
3. Smith, Bernard, private communication.
4. Bartel, H. R. and Rannie, W. D., “Solid fuel combustion as applied to ramjets,” Progress Rep 3–12, Jet Propulsion Laboratory, California Institute of Technology (September 1946)
5. Dembrow, D. and Pompa, M. F., “Status report on the liquid-solid rocket,” Johns Hopkins Universtiy, Applied Physics Laboratory, Rep CM-748, 14 August 1952.