1. Personalcommunication to Hollander;Abbott, O.A.,1951
2. Algenstadt, H., and Kampe, H. (1952). Tuberkulosearzt, 6, 664.
3. Aronovitch, M., Caswell, L. A., and Zade, J. A. (1947). Canad. med. Ass. J., 57, 122.
4. Aslett, E., and Jarman, T. F. (1945). Lancet, 1, 304.
5. Bailey, W. H. (1948). Amer. Rev. Tuberc., 57, 621.