1. DEVADATTA, S., BHATIA, A. L., ANDREWS, R. H., Fox, W., MlTCHlSON, D. A., RADHAKRISHNA, S., RAMAKRISHNAN, C. Y., SALKON, J. B. and YELUS, S. (1961) Bull. Wld. Hlth Org. 25, 807.
2. EADE, A. W., HARRlSON, G. K., LARGE, S. E., MACKAy-DICK, J., REID, L. and RIDDELL, R. W. (1959). Thorax. 14, 104.
3. EADE, A. W. T., HARRISON, G. K., LARGE, S. E. and MACKAy-DICK, J. (1968). J. ray. Army med. Cps.
4. FOSTER-CARTER, A. F., MYERS, M., GODDARD, D. O. H., YOUNG, F. H. and BENJAMIN, B. (1952). Brompton Hasp. Rep. 21, 1.
5. GRUMBACH, F., RIST, N. and RIEBEL, J. (1952). Ann. Inst. Pasteur. 83, 397.