1. Francis, G., Ionization Phenomena in Gases, Butterworths Scientific Publications, London, 1960.
2. Zauderer, B., Phys. Fluids 11 (1968) 2578.
3. Wilhelm, H. E. and B. Zauderer, Electricity from MHD Vol. 11. 733, International Atomic Energy Agency, Vienna, 1968.
4. Zauderer, B., AIAA J. 7 (1969) 2189.
5. Schottky, W., Z. Physik 25 (1924) 324.