1. J.H. Dessauer and H.E. Clark, Eds., Xerography and Related Processes, Focal Press, London and New York, 1965.
2. R.M. Schaffert, EZectrophotography, Focal Press, London, 1965.
3. R.G. Vyverberg, Ref. 1, p. 202.
4. R.W. Gundlach, Ref. 1, p. 259.
5. H.E.J. Neugebauer, Ref. 1, p. 217.