1. 1) T. Onoue and H. Yano: The Talk of an Edged Tool, (foundation Japanese Standards Association April 22, 2006 The 4th printing issue) pp. 169–173.
2. 2) JIS C9614-1995, Description Table 1.
3. 3) T. Sudo: The Actual Condition of Hair Pollution and a Preventative Measure, (a group form star, October 25, 1970 issue) pp. 99.
4. 4) K. Okado: Hair Various Subjects, Hairdressing Cosmetics, (Kyoiku Shuppan, The 1971-month revised-edition [April 10] issue) pp. 122.
5. 5) C. Kato, Y. Kawai, K. Soga and H. Fukui: Wood Society Magazine 36 (1990) 615–623.