Dara Hama, Hussain F Al-Huwaizi, and Salim A El-Samarri. 2013. “Evaluation of Propolis from Kurdistan Region As a New Resinous Sealer in Root Canal Obturation-Part I Biocompatibility Study”. Journal of Baghdad College of Dentistry 25 (3): 8-13. https://jbcd.uobaghdad.edu.iq/index.php/jbcd/article/view/251.