Agrawal, M., Q. B. Rahman, D. Naulakha, and R. Karki. “Assessment of Pain and Trismus and Determining the Difficulty Level of Tooth Extraction With Modified Parant Scale”. Birat Journal of Health Sciences, vol. 2, no. 3, Jan. 2018, pp. 282-6, doi:10.3126/bjhs.v2i3.18944.