1. Cancer Mortality for Selected Sites in 24 Countries;Segi,1972
2. Tobacco Consumption in Various Countries;Todd;Tobacco Research Council, Research Papers,1963
3. The sugar content and the pH of the smoke of cigarette, cigar and pipe tobaccos in relation to lung cancer;Elson;Int. J. Cancer,1972
4. Buffering capacity of the smoke of different tobaccos in relation to lung cancer risks;Elson;Cancer Lett.,1976
5. Cancers Related to Smoking;Doll,1972