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4. T. J. Harris and E. Mathieson, “Pulse Shape Discrimination in Proportional Counters-Experimental Results with an Optimised Electronic System,” Nucl. Inst. Meth. 96, 397–403 (1971).
5. D. B. Brown, “Electron Range and Electron Stopping Power,” in J. W. Robinson, Editor, Handbook of Spectroscopy, Vol. I, p. 249, CRC Press (1974).