1. Afridi HI, Kazi TG, Jamali MK, Kazi GH, Shar GQ (2006) The status of trace and toxic elements in biological samples (scalp hair) of skin-disease patients and normal subjects. Turk J Med Sci 36:223–230
2. Agency for Toxic Substances and Disease Registry (1990) Toxicological profile for silver. TP-90-24. Agency for Toxic Substances and Disease Registry, Atlanta
3. Bales RL (1983) White gold jewelry alloy. United States Patent 4396578
4. Barbosa AC, Jardim W, Dórea JG, Fosberg B, Souza J (2001) Hair mercury speciation as a function of gender, age, and body mass index in inhabitants of the Negro River Basin, Amazon, Brazil. Arch Environ Contam Toxicol 40:439–444
5. Bowen HJ, Comaish JS, Samitz MH (1975) Tissue nickel levels and nickel dermatitis. I. Nickel in hair. Br J Dermatol 93:187–190