Tomanakan, K., and J. Jongthawin. “Validity of Dot ELISA using crude somatic antigen of cholangiocarcinoma tumor mass”. The Clinical Academia, vol. 42, no. 2, Apr. 2018, pp. 73-77, https://he02.tci-thaijo.org/index.php/theclinicalacademia/article/view/173243.