1. H. Stuart, “Tantalum and Niobium-A Review of Worldwide Industry Statistics,” in Buletin No 104 (TBIC, 2000).
2. R. Henson, “Application for Ti-45 Nb Beyound the Aerospace Industry,” in Buletin No 102 (TBIC, 2000).
3. J. M. Eridon, “The Use of Tantalum and Niobium in The Manufacture of Superalloy,” in Buletin No 102 (TBIC, 2000).
4. T. Carneiro, “Industrial Scale Development of Gamma Titanium Aluminides for Specific Products in Advance Aircraft Engineering,” in Buletin No 102 (TBIC, 2000).
5. Decomposition of Niobium Ore by Sodium Hydroxide Fusion Method