K, Thaer, et al. “Immunohistochemical Expression of MMP9, As a Marker of Local Invasion in Hodgkin’s and Non-Hodgkin’s Lymphoma of the Head and Neck Region”. Journal of Baghdad College of Dentistry, vol. 27, no. 1, Mar. 2015, pp. 128-32, https://jbcd.uobaghdad.edu.iq/index.php/jbcd/article/view/647.