1. 1) JIS G 5502: Spheroidal Graphite Iron Castings, (2007).
2. 2) T. Shiota and S. Komatsu: J. JFS 54 (1982) 434–439.
3. 3) Y. Sugiyama, K. Asami and H. Wakasa: J. JFS 66 (1994) 666–671.
4. 4) K. Ohji: Hakai-Kyodo-Gaku, (Ohmsha, 1985) p. 194.
5. 5) H. Tamura, Y. Sugiyama and T. Kimura: J. JFS 69 (1997) 234–239.