1. 1. The Basic Law for Establishing the Recycling-based Society, The Ministry of Environment, Japan, 2000, http://law.e-gov.go.jp/htmldata/H12/H12HO110.html.
2. 2. The Japan Iron and Steel Federation, http://www.jisf.or.jp/data/.
3. 3. Non-Intergrated Steel Producers Association, http://www.fudenkou.jp/about_03.html.
4. 4. Uniform Standards of Ferrous Scrap, The Japan Ferrous Raw Materials Association, http://www.tetsugen.gol.com/kikaku/index.htm.
5. 5. The Society of Materials Science, Japan, http://www.jsms.jp/word/index-kato.html.