Niazi, M., Manzoor, N., Sajjad, S. and Qazi, H. S. (2017) “Morphological and attachment variations of median maxillary labial frenum”, Pakistan Orthodontic Journal, 9(1), pp. 19–23. Available at: https://www.poj.org.pk/index.php/poj/article/view/153 (Accessed: 21 April 2026).