1. Asinovskii, E. I., Pakhomov, E. P., and Yartsev, I. M., 1978, Tepl. Vys Temperatur, 16: 28.
2. Bartels, K. and Uhlenbusch, J., 1970, Z. Angew. Phys, 29: 122.
3. Devoto, R. S., 1969, AIAA J, 7: 199.
4. Fischer, E. and Uhlenbusch, J., 1967, in: “Proceedings, 7th International Conference on Phenomena in Ionized Gases, Beograd,” p. 725.
5. Hackmann, J., 1971, Thesis, Technical University Aachen, FRG.