Hamad, D. K., and B. A. Hassan. “Evaluation of Salivary Nickel, Chromium and Iron Ions in Patients Treated With Fixed Orthodontic Appliances in Vivo Study: In Vivo Study”. Erbil Dental Journal (EDJ), vol. 1, no. 2, Dec. 2018, pp. 109-16, doi:10.15218/edj.2018.15.