1. L. B. Loeb,Basic Processes in Gaseous Electronics(University of California Press, Berkeley, California, 1955), Chap. 4; part II gives an extensive bibliography and discussion of this early work.
2. We assume that the species are in approximate Maxwellian equilibrium.
3. D. Bohm, E. H. S. Burhop, and H. S. W. Massey,The Characteristics of Electrical Discharges in Magnetic Fields, edited by A. Guthrie and R. K. Wakerling (McGraw-Hill Book Company, Inc., New York, 1955), Chap. 2.
4. See reference cited in footnote 3, Chap. 3.
5. Microwave Study of Positive Ion Collection by Probes