Steph Smith, Jafer Al-Bohassan, Hassan Al-Moqhawi, Mohammad Alsuhayyih, Intisar Siddiqui, and Khalid Almas. “VERTICAL RADIOGRAPHIC ALVEOLAR BONE LOSS IN SMOKERS AND NON-SMOKERS WITH PERIODONTITIS: A PILOT STUDY”. Pakistan Oral & Dental Journal, Vol. 39, no. 4, Jan. 2020, pp. 317-24, https://podj.com.pk/index.php/podj/article/view/468.