ANSARI, F.; RAI, A.; SHUKLA, S. Study of carcinoma embryonic antigen and carbohydrate antigen 19-9 levels in patients of esophageal cancer. International Surgery Journal, [S. l.], v. 8, n. 11, p. 3274–3278, 2021. DOI: 10.18203/2349-2902.isj20214060. Disponível em: https://www.ijsurgery.com/index.php/isj/article/view/8214. Acesso em: 10 nov. 2025.