ERSOY, Osman, et al. “Diagnostic Value of High Molecular Weight Alkaline Phosphatase in Detection of Liver Metastasis in Gastrointestinal System Malignancies”. Turkish Journal of Gastroenterology, vol. 12, no. 4, Jan. 2001, pp. 253-7, https://www.turkjgastroenterol.org/index.php/tjg/article/view/1164.