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4. H.K. Henisch, R.W. Pryor and G.J. Vendura, “Characteristics and Mechanisms of Threshold Switching”,: J. Noncryst. Solids 8–10:415 (1972)
5. H.K. Henisch, W.R. Smith and M. Wihl, “Field-Dependent Photo-Response of Threshold Switching Systems,” in: Proc. the 5th Intl. Conf. on Amorphous and Liquid Semiconductors, Garmisch-Partenkirchen, Germany, J. Stuke and W. Brenig, eds., Taylor and Francis, London, 567 (1974)