CANORUÇ, Naime, et al. “SERUM SIALIC ACID AND ALKALINE PHOSPLATASE LEVELS AND THE IMPORTANCE IN THE DIAGNOSIS IN GASTROINTESTINAL CARCINOMA”. Turkish Journal of Gastroenterology, vol. 4, no. 4, Apr. 2020, pp. 656-60, https://turkjgastroenterol.avesjournals.com/index.php/tjg/article/view/228.