1. P. E. Moorhead and P. L. Stone, Survey of properties of T-111 (Ta-8W-2Hf), NASA-TN-D-5873, Lewis Res. Center, Cleveland, Ohio.
2. D. R. Stoner, Determination of weldability and elevated temperature stability of refractory metal alloys III-Effect of contamination level on weldability of refractory metals alloys, NASA-CR-1609, Astronuclear Lab. Westinghouse Electric Corp., Pittsburgh, Pa.