Mori, H., H. Kobara, N. Nishiyama, S. Fujihara, and T. Masaki. “Open Biopsy Guided by Endoscopic Ultrasonography from a Gastric Submucosal Tumor Growing Outside the Stomach”. Journal of Gastrointestinal and Liver Diseases, vol. 24, no. 1, Mar. 2015, pp. 106-8, doi:10.15403/jgld.2014.1121.ssv.