@incollection{Saber11,
author = {Aly Saber},
title = {Perforated Duodenal Ulcer in High Risk Patients},
booktitle = {Peptic Ulcer Disease},
publisher = {IntechOpen},
address = {Rijeka},
year = {2011},
editor = {Jianyuan Chai},
chapter = {15},
doi = {10.5772/24066},
url = {https://doi.org/10.5772/24066}
}