Goudar, B. V., and V. R. Kanchan. “Elevated Serum Bilirubin in Acute Appendicular Perforation As a Newer Serum Marker: A Diagnostic Validation Test”. International Surgery Journal, vol. 7, no. 2, Jan. 2020, pp. 414-8, doi:10.18203/2349-2902.isj20200289.