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4. D.R. Rhiger, R.D. Rodrigues and J.M. Peterson,Proc. IRIS Detector, Vol. 1 (1991), p. 191.
5. S.M. Johnson, D.R. Rhiger, J.P. Rosbeck, J.M. Peterson, S.M. Taylor and M.E. Boyd,J. Vac. Sci. B 10, 1499 (1992).