1. Micronutrients and cancer risk;Willett;Am J Clin Nutr.,1994
2. Does b-carotene explain why reduced cancer risk is associated with vegetable and fruit intake;Ziegler;Cancer Res.,1992
3. Vegetable and fruit consumption and cancer risk;Negri;Int J Cancer.,1991
4. The role of vegetable and fruits in cancer risk;Negri,1994
5. Role of carotenoids in antioxidant defense;Stahl,1994