1. Normal Mechanism of Swallowing;Barclay;Brit. J. Radiol.,1930
2. Normal Mechanism of Swallowing;Barclay;Proc. Staff Meet., Mayo Clin.,1930
3. Clinical Observations;Bell,1816
4. Ueber Oesophagus divertikel und seine Behandlung;Bergmann;Arch. klin. Chir.,1892
5. Surgical Management of Instrumental Perforation of the Esophagus;Bisgard;Arch. Surg.,1949