1. Oxidation of tantalum in the temperature range 500°–700°C;Kofstad;J. Inst. Metals,1962
2. Oxidation of tantalum at 300°–550°C;Kofstad,1961
3. J. Inst. Metals, in press.
4. P. Kofstad, to be published.
5. Plansee Proc. 3rd Plansee Seminar;Gebhardt,1958