1. British Patent 802,905, Oct., 15, 1958;899,970, june 22, 1962.
2. German Patent 970,904, Nov. 13, 1958; 1,078,095, March 24, 1960.
3. Austr. Patent 206,184, Nov. 10, 1959.
4. U.S. Patent 3,081,254, March 12, 1963.
5. RECENT DEVELOPMENTS IN THE FIELD OF SILICIDES AND BORIDES OF THE HIGH-MELTING-POINT TRANSITION METALS