Bhuyian, R., M. G. Azam, M. A. Rob, T. M. Bhuiyan, and M. A. Rahman. “Diagnostic Accuracy of Serum Carbohydrate Antigen 19-9 in Determining Etiology of Obstructive Jaundice”. BIRDEM Medical Journal, vol. 7, no. 2, May 2017, pp. 95-100, doi:10.3329/birdem.v7i2.32443.