[1] W. L. Nighen, J. H. Bennet;Appl. Phys. Lett., 1969, 14, No. 8, 240.
[2] P. Bletzinger, A. Garscadeden; Phys. Lett., 1969, 29A, 265.
[3] P. Avivi et al.; J. Appl. Phys., 1971, 42, 5551.
[4] J. D. Swift, M. J. B. Schwar; Electrical Probes for Plasma Diagnostics, London Iliffe Books LID, 1970.