1. Abbott, M.E. (1919). Contributions to Medical and Biological Research, New York, 2, 899.
2. Abbott, M.E. (1927). Osler and Macrae's Modern Medicine, 4, 710.
3. Abbott, M.E. (1937). Nelson's Loose LeqfMedicine, 4, 269.
4. Baginsky, B. (1879). Berl. klin. Wschr., 16, 439.
5. Bain, C. W. C., and Parkinson, J. (1943). Brit. Heart J., 5, 97.