1. Nonsurgical causes of pneumoperitoneum;Mularski RA;West J Med,1999
2. Asymptomatic pneumoperitoneum diagnostic and therapeutic dilemma;Mezghebe HM;Am Surg,1994
3. Nonsurgical pneumoperitoneum: a case report and a review;Rowe NM;Am Surg,1998
4. Pneumoperitoneum secondary to a pulmonary air leak;Donahoe PK;J Pediatr,1972
5. Pneumoperitoneum complicating mechanical ventilator therapy;Turner WW;Arch Surg,1977