Ashok, N. G. ., and D. Ganapathy. “Evaluation of Upper Lip Elevation to the Ideal Lip Height in the Students of a Dental College”. International Journal of Orofacial Research, vol. 2, no. 2, Aug. 2022, pp. 51-3, https://editorialmanager.in/index.php/ijofr/article/view/447.