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2. R. H. Healey and J. W. ReedThe Behaviour of Slow Electrons in GasesAmalgamated Wireless (Australia) Limited, Sydney, 1941.
3. J. Townsend, Electrons in Gases, Hutchinson’s Scientific and Technical Publications, London, 1947.
4. H. S. W. Massey and E. H. S. Burhop, Electronic and Ionic Impact Phenomena, Oxford, At the Clarendon Press, 1952.
5. L. B. LoebBasic Processes of Gaseous ElectronicsUniversity of California Press, Berkeley and Los Angeles, 1955.