1. Carter, M. G., Gaensler, E. A., &Kyllonen, A. pneumoperitoneum m the Treatment of Pulmonary Emphysema. New England. J. Med.243: 549–558 (1950)
2. Boyd, William A Textbook of Pathology. Philadelphia. Lea & Febiger. (1943), pp. 445–447.
3. Pokorny, C. The Pre-operative Management of the Patient with Chronic Respiratory Disease Current Researches. in Anesth. & Analg.35: 260–273 (1956).
4. Segal, M. S., &Dulfano, M. J. Chrome Pulmonary Emphysema. Moderni Medical Monographs Green & Stratton. (1953).
5. Comroe, Forster, Dubois, Briscoe, Carlsen The Lung. Chicago: Yearbook Publishers. (1951).