Alhabashneh, R., M. A Mashal, Y. Khader, and R. Qudah. “Clinical and Biological Effects of Adjunctive Photodynamic Therapy in Refractory Periodontitis”. Journal of Lasers in Medical Sciences, vol. 10, no. 2, Feb. 2019, pp. 139-45, https://journals.sbmu.ac.ir/jlms/article/view/19889.