1. A study of etiological factors in cancers of the esophagus;Wynder;Cancer,1961
2. Le cancer de l'oesophage en Ille-et-Vilaine en fonction des niveaux de consommation d'alcool et de tubac. Des risques qui se multiplient;Tuyns;Bull Cancer,1977
3. Alcohol as a cofactor in the etiology of cancer;Schottenfeld;Cancer,1979
4. Epidemiological assessment of aetiology of esophageal cancer in Greater Bombay;Jussawalla,1971
5. Opium and oesophageal cancer in Iran;Kmet;Lancet,1978