1. Lupton D, Schiffmann W, Schreiber F, Heitz E. Corrosion behavior of tantalum and possible substitute material under extreme conditions. In: Proceedings the 8th International Congress on Metallic Corrosion, Frankfurt-am-Main, Germany 1981;2:1441–46
2. Lupton D, Aldinger F. Possible substitutes for tantalum in chemical plant handling mineral acids. In: Proceedings of the 10th Plansee Seminar, Reutte, Austria 1981;1:101–30
3. Rosenqvist T, editor. Principles of extractive metallurgy. Tokyo: McGraw-Hill, 1973
4. Pinatti DG, Baldan CA, Conti RA, Dainesi CR, Lopes RJ. Electron beam refining of niobium in the Lorena plant. In: Proceedings of the Status Seminar – Niobium Technology, Guaratinguetá, Brazil 1984;1:237–59
5. Pinatti DG, Baldan CA, Conti RA, Dainesi CR, Sandim HRZ. A decade of electron beam melting of refractory metals in Brazil. In: Proceedings of the Conference Electron Beam Melting and Refining-State of the Art, Reno, USA 1990:147–61