Houlton, Tobias MR, Nicolene Jooste, André Uys, and Maryna Steyn. “Lip Height Estimation in a Southern African Sample”. South African Dental Journal 75, no. 8 (September 30, 2020): 415–424. Accessed May 2, 2024. https://journals.assaf.org.za/index.php/sadj/article/view/10577.