1. Biondi, M. A., Chemical Reactions in the Lower and Upper Atmosphere, Interscience, New York-London (1961).
2. Biondi, M. A., Adv. Electronics and Electr. Phys., 18:67 (1963).
3. Biondi, M. A., Ann. Geophys., 20:34 (1964).
4. Whitten, R. C., and Poppoff, I. G., J. Atm. Sci., 21:117 (1964).
5. McDaniel, E. W., Coll. Phen. Ioniz. Gases, New York-London (1964).