1. The Course of the CEsophagus in Health, and in Disease of the Heart and Great Vessels;Evans, W.;Medical Research Council, Special Reports Series,1936
2. Gross, R. E. (1939). New Eng. Jour. Med., 220, 510.
3. Palmieri, G. G. (1921). Arch. Mal. Carur, 14, 440.
4. Palmieri, G. G. (1929). Acta radiol., 10, 127.
5. Parkinson, J. (1936). Lancet, 1, 1337.