Variations in plasma lycopene and specific isomers over time in a cohort of U.S. men.
Wu K, Schwartz SJ, Platz EA, Clinton SK, Erdman JW, Ferruzzi MG, Willett WC, Giovannucci EL. Variations in plasma lycopene and specific isomers over time in a cohort of U.S. men. J Nutr. 2003 Jun; 133(6):1930-6.