1Radenovski D, Tsekov KH, Savov I, et al. The surgical treatment of perforated gastric and duodenal ulcers in middle - aged and elderly patients - an analysis of the 1985 - 1996 period[ J]. Khimrgiia( Sofiia), 1998, 51(3) :28-30.
2Gore RM, Miller FH, Pereles FS, et al. Helical in the evaluation of the acute abdomen [ J ]. A JR,2000,174 (5) : 901-903.
3Jamieson GG. Current status of indications for surgery in peptic ulcer disease[J]. World J Surg,2000,24(3) :256-258.
