1. Bedson, S. P., and Bland, J. 0. W. (1929). Brit. J. exp. Path., 10, 393.
2. Brain, R. T. (1932). Brit. J. exp. Path., 13, 166.
3. Virus as Organism;Burnet, F.M.,1945
4. Burnet, F. M. and Lush, D. (1939). Lancet, 1, 629.
5. Casals, J. (1947). J. Immunol., 56, 337.