Abraham, A., T. U. Girish, B. J. Sharathchandra, S. V. Madhunapantula, M. K. Yadav, and S. R. Erabati. “Serum Pepsinogen I and Pepsinogen II Levels and Its Ratio in Patients With Gastric Cancer: A Case Control Study”. International Surgery Journal, vol. 4, no. 1, Dec. 2016, pp. 356-60, doi:10.18203/2349-2902.isj20164469.