Bhumsaidon, A., and M. . Chamchong. “Variation of Lycopene and Beta-Carotene Contents After Harvesting of Gac Fruit and Its Prediction”. Agriculture and Natural Resources, vol. 50, no. 4, Aug. 2016, pp. 257-63, https://li01.tci-thaijo.org/index.php/anres/article/view/244039.