1. Attinger, E. O., Goldstein, M. M., and Segal, M. S. (1956). Amer. Rev. Tuberc., 74, 210.
2. Bjurstedt, H., and Hesser, C. M. (1953). Acta physiol. scand., 29, 180. Ciba Symposium (1959). Thorax, 14, 286.
3. Civin, W. H., and Edwards, J. E. (1951). A.M.A. Arch. Path., 51, 192.
4. Cudkowicz, L. (1952). Thorax, 7, 270.
5. Le Noble and Bronder;Dekker, E.,1958