1. D. R. Olsen and K. G. Spanjer, “Solder System,” U.S. Patent 4,170,472, Oct. 9, 1979.
2. C. S. Cheng, Acta Physica Sinica,14, 393 (1958).
3. ASM Metals Handbook, Vol. 8, Metallography, Structures and Phase Diagrams, American Society for Metals, Metals Park, Ohio 1973.
4. F. N. Rhines, Phase Diagrams in Metallurgy, McGraw-Hill Book Co., 1956.
5. D. R. Olsen and K. G. Spanjer, Improved Cost Effectiveness and Product Reliability Through Solder Alloy Development, Solid State Technology, September, 1981, p. 121.