1. Agata T (1997) Mantel-extention method. In: Basic medical statistics (in Japanese). Chugai-Igaku Publishers, Tokyo, pp 114–118
2. Araya M, Olivares M, Pizarro F, González M, Speisky H, Uauy R (2003) Copper exposure and potential biomarkers of copper metabolism. BioMetals 16:199–204
3. Arisawa K, Nakano A, Saito H, Liu X-J, Yokoo M, Soda M, Koba T, Takahashi T, Kinoshita K (2001) Mortality and cancer incidence among a population previously exposed to environmental cadmium. Int Arch Occup Environ Health 74:255–262
4. Beliles RP (1994) Copper. In: Clayton GD, Clayton FE (eds) Patty’s industrial hygiene and toxicology, 4th edn, vol 2, Part C Toxicology. Wiley, New York, pp 1999–2006
5. Beneš B, Spěváčková V, Šmíd J, Čejchanová M, Kaplanová E, Černá M, Gajewská V, Blatný J (2002) Determinatnion of normal concentration levels of Cd, Pb, Hg, Cu, Zn and Se in urine of the population in the Czech Republic. Cent Eur J publ Health 1–2:3–5