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2. The Surgery of Mediastinal Tumors; Special Monograph;Heuer;Am. J. Surg.,1940
3. Shanks, S. C., Kerley, P., and Turning, E. W.: A Textbook of X-ray Diagnosis, vol. 1, p. 353.
4. The Etiology of Thin-Walled Thoracic Cysts;Lambert;J. Thoracic Surg.,1940