DUMLU, Şükrü, Mehmet CİNDORUK, Selahattin ÜNAL, Ümit Bilge DOĞAN, Ahmet GÖRGÜL, Aytuğ ÜNER, and Uğur KANDİLCİ. 1997. “CA 19-9 and Morphologic Criteria in Differential Diagnosis of Malign Gastric Ulcers”. Turkish Journal of Gastroenterology 8 (2):197-200. https://turkjgastroenterol.org/index.php/tjg/article/view/782.