Ahmed, Maha A, et al. “Time-Related Salivary Cathepsin B Levels and Periodontal Status in Different Orthodontic Force Magnitudes”. Journal of Baghdad College of Dentistry, vol. 27, no. 2, June 2015, pp. 115-22, https://jbcd.uobaghdad.edu.iq/index.php/jbcd/article/view/722.