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2. G. R. Fitterer: Some Fundamental Problems in the Manufacture of Steel by the Acid Open Hearth Process, Campbell Memorial Lecture, Trans. ASM, vol. 34, 1944, p. 1.
3. G. R. Fitterer, J. W. Linhart, B. B. Rosenbaum, J. B. Kopec, S. Poch, and W. G. Wilson: Acid Open Hearth Slag Fluidity and Its Significance, Bulletin No. 1, Acid Open Hearth Research Association, Pittsburgh, Pa.
4. J. W. Linhart: Control of Acid Open Hearth Heats through Measurements of Slag Fluidity, National Open Hearth Proceedings, AIME, 1946, p. 299.
5. G. R. Fitterer: Some Observations of Slag-Metal Relations in the Acid Open Hearth Steel Furnace, Journal of Metals, Dec. 1953, pp. 1634–1640.