1. Honda, K., Murakami, T., “On the Structure of Tungsten Steels”, Sci. Rep. Tohoku Imperial Univ., 6(5), 235–284 (1918) (Morphology, Phase Diagram, Experimental, Magn. Prop.) as quoted by [1920Hul2] and [1930Tak1]
2. Hultgren, A., “Tentative Iron-Tungsten-Carbon Diagram”, A Metallographic Study on Tungsten Steels, John Wiley & Sons, Inc., New York, Chapman & Hall, Limited, London, 63–67 (1920) (Phase Diagram, Experimental, 1)
3. Hultgren, A., “Investigations on Tungsten Steels by Honda and Murakami”, A Metallographic Study on Tungsten Steels, John Wiley & Sons, Inc., New York, Chapman & Hall, Limited, London, 79–85 (1920) (Morphology, Phase Diagram, Phase Relations, Review, Magn. Prop., 2)
4. Daeves, K., “Limits of Solubility for Carbon in Ternary Steels. II. The System Tungsten-Iron-Carbon” (in German), Z. Anorg. Chem., 118, 67–74 (1921) (Morphology, Phase Diagram, Phase Relations, Experimental, 10)
5. Hultgren, A., “Tungsten Steels” (in German), Stahl Eisen, 41(49), 1824–1828 (1921) (Phase Diagram, Phase Relations, Experimental, 1)