1. T.H. Schofield: J. Inst. Metals, 1956–57, vol. 85, pp. 372–74.
2. J.B. Lambert and J.J. Rausch: Refractory Metals and Alloys, ASM Handbook, vol. 2, ASM International, 1990, pp. 557–65.
3. ASTM B393-18, Standard Specification for Niobium and Niobium Alloy Strip, Sheet, and Plate, ASTM International, West Conshohocken, PA, 2018, www.astm.org.
4. 4.A. N. Behera, R. Kapoor, A. Sarkar and J. K. Chakravartty: Mater. Sci. Technol., 2014, vol. 30, pp. 637-644
5. G. Brinson and B. B. Argent: J. Inst. Metals, 1962–63, vol. 91, pp. 293–98.