Arenga, P. J. P., and J. M. Villanueva. “The Use of a Soft Gel Capsule As a Medium for Modified Barium Esophagogram in Detecting Esophageal Foreign Body”. Philippine Journal of Otolaryngology Head and Neck Surgery, vol. 30, no. 1, June 2015, pp. 59-62, doi:10.32412/pjohns.v30i1.397.