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, Jan. 1993, pp. 656-60, https://turkjgastroenterol.org/index.php/tjg/article/view/359.