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3. (c) Friedrich Harders, and Sigismund Kienow , Feuerfestkunde (Refractories) , pp.35 -37 , 35 -37 , and35 . Springer-Verlag, Berlin, 1960 . 35 pp.; Ceram. Abstr., 1960 , p.35 .
4. (d) J. H. Chesters , Steelplant Refractories , 2d ed. , pp.197 -237 . Percy Lund, Humphries & Co., Ltd., London, 1957 . 197 pp.Obtainable from United Steel Companies, Ltd., Sheffield, England; Ceram. Abstr., 1957 , p.197 .