1. Plasma Heating of Supersonic Airstream
2. J. C. Williams, III,The Decaying Plasma as a Method of Heating the Supersonic Airstream(Stanford University Press, Stanford, California, 1959), p. 222.
3. A Cool Mercury Plasma Tunnel
4. The Transition from Free to Ambipolar Diffusion
5. S. C. Brown, “Breakdown in Gases: Alternating and High Frequency Fields,”Encyclopedia of Physics(Springer-Verlag, Berlin, Germany, 1956), Vol. 32, p. 531–575.