Phan, H. H., V. Punyawattananon, D. M. Tri, N. Chotprasert, and K. Sipiyaruk. “Lightweight Opened Hollow Bulb Obturator Using a Precise Positioning Method of Metal Framework in Patients With Partial Maxillectomy: A Case Report: A Clinical Report”. Khon Kaen University Dental Journal, vol. 22, no. 2, Dec. 2019, pp. 166-71, https://he01.tci-thaijo.org/index.php/KDJ/article/view/193470.