1. Abramson, J. L. (1924). Ann. Clin. Med., 3, 327.
2. Arnold, J. (1890). Beitr. path. Anat., 8, 29.
3. Aronstein, C. G., and Neuman, L. (1939). Arch. Pathol., 27, 907.
4. Aubertin, C., and Rime, G. (1926). Presse med., 4, 736.
5. Bamberger, V. (1872). Wien. med. Wschr., 22, 26.