1. 1) RECOM Co. LTD, Hwaseong-city, Gyeonggi-do, Korea, private communication (February 2009).
2. 2) P. A. Wright: Extractive metallurgy of tin, (New York, Elsevier science publishing company Inc., 1982) pp. 241–252.
3. 3) M. Hansen and K. Anderko: Constitution of Binary Alloys, (New York, McGraw-Hill Book Co., 1958) p. 52.
4. 4) http://www.springerlink.com/content/v5j647p44615mx06/fulltext.pdf?page=1
5. 5) C. B. Gill: Nonferrous Extractive Metallurgy, (New York, JOHN WILEY & SONS Inc., 1980) p. 112.