1. M. Hansen:Constitution of Binary Alloys, 2nd ed., pp. 41, 173, 325, and 1101, McGraw-Hill Book Co., New York, 1958.
2. M. Izawa and T. Tanaka:J. MiningMet. Inst. Jap., 1961, vol. 77, pp. 483–90.
3. T. Sato and T. Nishizawa:J. Jap. Inst. Metals, 1956, vol. 20, pp. 51–55.
4. W. Hoftnann:Blei und Bleilegierungen, pp. 119–20, Springer-Verlag, Berlin, 1962.
5. J. W. Mellor:A Comprehensive Treaties on Inorganic and Theoretical Chemistry, vol. 9, p. 19, Longmans, 1960.