1. Estimates of the worldwide frequency of sixteen major cancers in 1980;Parkin;Int J Cancer,1988
2. Global epidemiology and aetiology of oral cancer;Smith;Int Dent J,1973
3. Statistical and pathological analysis of oral tumors in the Hong Kong Chinese;Wu;J Oral Pathol,1986
4. Malignant oral tumours in Peninsular Malaysia – a preliminary report on 2,263 cases;Ramanathan;Med J Malaysia,1979
5. An epidemiological study of oral and pharyngealcancer in central and southeast Asia;Hirayama;Bull World Health Organ,1966