Extractive metallurgy of refractory metals proceedings of a symposium sponsored by the TMS-AIME Refractory Metals Committee and the Physical Chemistry of Extractive Metallurgy Committee at the 110th AIME annual meeting, Chicago, Illinois, February 22-26, 1981 - Carlson, O. Norman; Sohn, Hong Yong; Smith, J. Thomas (Conference proceedings, 1980)