1. 1) D. Knittel and R. Webster: Proc. of 5th Int. Conf. Zirconium in the Nuclear Industry, ASTM, Philadelphia, (1981), 191.
2. 2) L. Lunde and K. Videm: Proc. of the 4th Int. Conf., Zirconium in the Nuclear Industry, ASTM, Philadelphia, (1979), 40.
3. Ductile Zirconium from Zircon Sand