1. Bignall, J. R. 1958. Carcinoma of the lung. London, E. and S. Livingstone Ltd.
2. Bryson. C. C. and Spencer, H. 1951. Carcinoma of the bronchus. Quart. J. Med., 20, 173–186.
3. Doll, R., Hill, A. B. and Kreyberg, L. 1957. The significance of cell type in relation to the aetiology of lung cancer. Brit. J. Cancer, 11, 43–48.
4. Ederer, F. and Mersheimer, W. L. 1962. Sex differences in the survival of lung cancer patients. Cancer, 15, 425–432.
5. Feinstein, A. R., Gelfman, N. A., Yesner, R., Auerbach, O., Hackel. D. B. and Pratt, P. C. 1970. Observer variability in the histopathological diagnosis of lung cancer. Amer. Rev. resp. Dis., 101, 671–685.