Khalf, Sudad A., and Kifah H. Abdulghafour. “CA19-9 and CK Immunohistochemical Expression in Pancreatic and Ampulla of Vater Carcinomas (A Clinicopathological Study”. Journal of the Faculty of Medicine Baghdad, vol. 56, no. 3, Oct. 2014, pp. 308-12, https://doi.org/10.32007/jfacmedbagdad.563508.