1. Ransley and Neufeld: Jnl. Inst. Metals. (Aug. 1948) 74, 599.
2. Baukloh and Oesterlen: Ztsch. Metallkunde. (1936) 30, 386.
3. A. Sieverts: Ztsch. Metallkunde. (1929) 21, 37.
4. L. F. Mondolfo: Metallography of Aluminum Alloys. 1943. New York. John Wiley and Sons.
5. International Critical Tables. 7, 231.