1. Cancer statistics, 1989;Silverberg;CA,1989
2. Tobacco;Wynder,1982
3. The Health Consequences of Smoking. A Report of the Surgeon General;US Department of Health and Human Services,1982
4. Dentition, diet, tobacco, and alcohol in the epidemiology of oral cancer;Graham;JNCI,1977
5. Tobacco and tobacco smoke;Wynder,1976