Goya, Cemil, et al. “Gastroduodenal Intussusception Secondary to Gastric Signet Ring Cell Carcinoma: A Case Report and Review of the Literature”. International Journal of Basic and Clinical Studies, vol. 2, no. 2, Sept. 2013, pp. 108-11, https://www.ijbcs.com/ijbcs/article/view/ijbcs02214.