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Trí, N.V., Thảo, L.B., Giang, C.N., Ngọc H.T. and Vinh, B.T. 2019. Purification and quantitative analysis of β-ecdysone from the leaf of yew (Taxus wallichiana) cultivated in Da Lat city, Lam Dong province. CTU Journal of Science. 55, 5 (Oct. 2019), 12-17. DOI:https://doi.org/10.22144/ctu.jvn.2019.122.