1. A. Pacz, U.S. patent 1,387,900 (1920).
2. C.E. Ranslay and H. Neufeld, “Solubility Relations in the Al−Na and Al−Si−Na Systems,”J. Inst. Metals, 78 (1950–1951), pp. 25–46.
3. B. Closset and J. E. Gruzleski, “A Study on the Use of Pure Metallic Strontium in the Modification of Al−Si Alloys,”AFS Transactions, 89 (1981) pp. 801–808.
4. G.K. Sigworth, “Theoretical and Practical Aspects of the Modification of Al−Si Alloys,”AFS Transactions, 91 (1983), pp. 7–16.
5. F. Fommei, “Modification Treatment of Al−Si Alloys,”Aluminum, 46 (1977), pp. 121–135.