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Hieu, L.T., Son, L.L., Nhung, N.M., Vu, H.X.A. and Thi, T.T.A. 2019. Determination of luteolin from extracts of Helicteres hirsuta by HPLC. Hue University Journal of Science: Natural Science. 128, 1B (Jul. 2019), 43-47. DOI:https://doi.org/10.26459/hueuni-jns.v128i1B.5195.