1. Birch-Hirschfeld, F. V. (1898). Beit. path. Anat., 24, 343.
2. Bothe, A. E. (1931). Surg. Clin. N. Amer., 11, 1,471. Busse, 0. (1899). Virch. Arch., 157, 346.
3. Coley, W. B. (1935). Amer. J. Surg., 29, 463.
4. Dean, A. L., and Pack, G. T. (1932). J. Amer. med. Ass., 98, 10.
5. (quoted by Wilms);Eberth, C.J.;Virch. Arch,1872