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Abdul-Hammed, M.; Bello, I. A.; Oladoye, S. O. 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. Pakistan Journal of Scientific & Industrial Research 2013, 56, 90-97.