Almakhzomi, Khulood A, and Nidhal H Ghaib. “Evaluation of Frictional Forces Generated by Different Brackets and Orthodontic Wires”. Journal of Baghdad College of Dentistry, vol. 25, no. Special Is, July 2013, pp. 126-31, https://jbcd.uobaghdad.edu.iq/index.php/jbcd/article/view/211.