TABACARU, C., C. SOCACIU, and G. NEAMTU. “Optimization of Lutein-Zeaxanthine Separation on High Performance Liquid Chromatography”. Notulae Botanicae Horti Agrobotanici Cluj-Napoca, Vol. 23, no. 1, Aug. 1993, pp. 125-33, doi:10.15835/nbha231343.