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2. J.W. Thatcher and W.J. Campbell, “Applications of a Fluorescent X-Ray Spectrograph Probe,” Pittsburgh Conference on Analytical Chemistry and Applied Spectroscopy, Pittsburgh Pa., March 1959.
3. K.F.J. Heinrich and T.D. McKinley, “X-Ray Spectrometry Applied to Small Areas Using a Commercial Instrument,” Pittsburgh Conference on Analytical Chemistry and Applied Spectroscopy, Pittsburgh, Pa., March 1960.
4. K.F.J. Heinrich, Advances in X-Ray Analysis, Vol. 3, University of Denver, Plenum Press, New York, 1960, pp. 95–107.