Acar, Türker, Duran Efe, Ahmet Okuş, İrfan Öcal, and Mustafa Harman. “A Rare Solid Tumor of the Retroperitoneum With Venous Extension and Lung Metastasis: Extra-Gastrointestinal Stromal Tumor”. Turkish Journal of Gastroenterology 26, no. 4 (January 4, 2015): 358–359. Accessed January 1, 2026. https://turkjgastroenterol.org/index.php/tjg/article/view/2785.