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- [23] Spontaneous pneumoperitoneum and retropneumoperitoneum without alimentary tract perforation ZENTRALBLATT FUR CHIRURGIE, 1996, 121 (10): : 861 - 865
- [27] PNEUMOPERITONEUM FOLLOWING GASTROSCOPY APPARENTLY WITHOUT PERFORATION - REPORT OF A CASE NEW ENGLAND JOURNAL OF MEDICINE, 1947, 237 (23): : 843 - 845