1. Vitamin A in animal and human nutrition;Underwood;Retinoids,1984
2. Bioavailability of carotenoids in human subjects;Parker;Proc. Nutr. Soc.,1999
3. A novel extrinsic reference method for assessing the vitamin A value of plant foods;Edwards;Am. J. Clin. Nutr.,2001
4. A novel extrinsic reference method for assessing the vitamin A value of plant foods;Panel on Micronutrients. Subcommittees on Upper Reference Levels of Nutrients and of Interpretation and Use of Dietary Reference Intakes,Standing Committee on the Scientific Evaluation of Dietary Reference Intakes, Food and Nutrition Board, Institute of Medicine,2001
5. A novel extrinsic reference method for assessing the vitamin A value of plant foods;National Research Council,1989