Sarra, B., M. Yosra, and M. Lamia. “Maxillary Rehabilitation With Combined Fixed-Removable Prosthesis Using Extra Coronal Semi Precision Attachment: Case Report”. Asian Journal of Dental Sciences, Vol. 4, no. 4, Dec. 2021, pp. 134-41, https://journalajds.com/index.php/AJDS/article/view/30170.