1. Boyer, L. B. (1946). Amer. Rev. Tuberc., 54 111.
2. Buckles, M. G., Potts, W. L., Davidson, H. B., and Neptune, W. B. (1951). Ibid., 64, 394.
3. Cabitt, H. L., Singer, J. J., and Graham, E. A. (1936). J. thorac. Surg., 5, 259.
4. Dormer, B. A., Friedlander, J., and Wiles, F. J. (1944). Amer. Rev. Tuberc., 50, 283.
5. Ibid., 51, 62, 455, 519.