1. Smithells, C. J., U.S. Patent No. 2,183,359, 1939.
2. Price, G. H. S., S. V. Williams, and C. J. Garrard, “Heavy Alloy: Its Production, Properties, and Uses,” Brit. GEC J. (August 1941), pp. 1–15.
3. Greens, Jones, and Titkin, “Developments in High-Density Alloys,” Special Report No. 58, Symposium on Powder Metallurgy, Iron and Steel Institute (London), May 1954.