Masoumi, Seyed Mohammad Reza. “Antimicrobial Activity of the Essential Oil from Seed and Oleo-Gum-Resin Ferula Assa Foetida Against Oral Pathogens”. Frontiers in Dentistry (January 30, 2019). Accessed March 27, 2019. http://jdt.tums.ac.ir/index.php/jdt/article/view/2498.