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2. Inhibition of experimental oral carcinogenesis by topical beta carotene;Suda;Carcinogenesis,1986
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4. Regression by vitamin E of experimental oral cancer;Shklar;J Natl Cancer Inst,1987
5. Regression of experimental oral carcinomas by local injections of beta carotene and canthaxanthin;Schwartz;Nutr Cancer,1988