alaaeldin, Eman, et al. “Formulation and Characterization of Thymoquinone Bioadhesive Gel for Treatment of Chronic Gum Inflammation”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 31, no. 2, Jan. 2017, pp. 321-30, https://gssrr.org/JournalOfBasicAndApplied/article/view/10554.