Garg, R.K., Gupta, R., Kailasia, Y., Chhari, A.S., Jain, M. and Dubey, C. 2016. Spectrum of nontraumatic perforation peritonitis: a prospective study of 277 cases with special reference to morbidity and mortality. International Surgery Journal. 3, 3 (Dec. 2016), 1223–1228. DOI:https://doi.org/10.18203/2349-2902.isj20161435.