1. 2) Japan Aluminum Association: “Aluminum statistics”, <http://www.aluminum.or.jp/toukei/j-pdf.htm>, (2006/12/18).
2. 4) Japan Light Metal Association: Report of research and investigation for treatment and recycling of aluminum dross, (1997).
3. 5) Japan Light Metal Association: Report of research and investigation for treatment and recycling of aluminum dross, (1998).