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Abdul-Hammed, M., Bello, I.A. and Oladoye, S.O. 2013. Simultaneous Spectrophotometric Determination of Lycopene and Beta-Carotene Concentrations in Carotenoid Mixtures of the Extracts from Tomatoes, Papaya and Orange Juice: Lycopene and ?-Carotene Determination. Biological Sciences - PJSIR. 56, 2 (Aug. 2013), 90–97. DOI:https://doi.org/10.52763/PJSIR.BIOL.SCI.56.2.2013.90.97.