1. I. Va?ek, Planseeber. Pulvermet.,7, No. 1, 6 (1959).
2. G. V. Samsonov and V. I. Yakovlev, Poroshkovaya Met., No. 7, 45 (1967).
3. G. V. Samsonov and V. I. Yakovlev, Poroshkovaya Met., No. 8, 10 (1967).
4. G. V. Samsonov and V. I. Yakovlev, ?Effect of the transition metals on the sintering of tungsten,? in: Sintered Materials and Components [in Russian], Erevan (1969), p. 135.
5. I. F. Pryadko, Investigation of the Nature of Some Properties of the Transition Metals and Their Compounds [in Russian], Author's abstract of dissertation, Institute of Materials Science, Academy of Sciences of the Ukrainian SSR, Kiev (1968).