Chitchumroonchokchai, Chureeporn. "Lutein and zeaxanthin: use of in vitro models to examine digestive stability, absorption, and photoprotective activity in human lens epithelial cells." Doctoral dissertation, Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=osu1095778573Chicago Manual of Style (17th edition)