1. W. E. Nicolet, C. E. Shepard, K. J. Clark, A. Balakrishnan, J. P. Kesserling, K. E. Suchsland, and J. J. Reese, Report AEDC-TR-75-47 (1975).
2. J. F. Schaeffer, AIAA Paper No. 78-68 (1978).
3. J. Bacri and S. Raffanel, Report No. 40277-86-1 (1986).
4. H. Massey, inNegative ions, 3rd edn., Cambridge University Press, New York (1976).
5. B. M. Smirnov, inNegative ions, McGraw-Hill, New York (1982).