K. Renaldi, A. N. Prahasary, M. H. Yuwaafi, and M. Maulana, “Serum CA 19-9 of Pancreatic Solid Mass Patients in Dr. Cipto Mangunkusumo National Central General Hospital”, InaJGHE, vol. 21, no. 3, pp. 188–192, Dec. 2020.