David Charles. P, and Anusha Sreedharan. “Prosthetic Rehabilitation of a Patient With Alzheimers Disease Using a Combined Ball, Bar and Clip Retained Implant Supported Overdenture: A Case Report”. Global Journal of Medical Research, vol. 17, no. J2, July 2017, pp. 1-3, https://medicalresearchjournal.org/index.php/GJMR/article/view/1389.