Agustin, Esthiningrum, 		Putro, Mamiek, AND 		Purbayu, Herry.
" Characteristic of Patients with Gastric Perforation due to Peptic Ulcer in Dr. Soetomo General Hospital Surabaya in the Period of January - December 2016" <em>JBN (Jurnal Bedah Nasional)</em> [Online], Volume 3 Number 2 (1 September 2019)