M.H, N., C. Y.M, M. A.N, C. C.H, and M. Ali Hashim. “Isolation and Identification of Individual Palm Carotenes Using Supercritical Fluid Chromatography”. Malaysian Journal of Science, vol. 25, no. 2, Aug. 2006, pp. 139-45, https://juku.um.edu.my/index.php/MJS/article/view/8147.