Seekla, N., K. Ratanasthien, and U. Maghanemi. “A Novel Cassette Holder for Head and Cervical Spine Radiography”. Journal of Associated Medical Sciences, vol. 41, no. 3, Sept. 2008, p. 175, https://he01.tci-thaijo.org/index.php/bulletinAMS/article/view/60104.