Mohammed, N., and M. Al-Janabi. “Force Decay of Orthodontic Elastomeric Chains by Using Three Different Mechanisms Simulating Canine Retraction”. Journal of Baghdad College of Dentistry, Vol. 25, no. 1, 1, pp. 159-63, https://jbcd.uobaghdad.edu.iq/index.php/jbcd/article/view/155.