1. G. P. Luchinsky, Chemistry of Titanium, State Chem. Press, Moscow, 1941,
2. Gmelin's Handbuch der anorg. Chem., System Number 41, Titan, 1951.
3. M. P. Slavinsky, Physicochemical Properties of the Elements, Metallurg. Press, Moscow, 1952, p. 244.
4. A. E. Van-Arkel, Reine Metalle, Berlin, J. Springer, 1939.
5. J. Barkdale, Titanium, Ronald Press, N. Y., 1949.