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Sri Wahdaningsih, Sugeng Riyanto, and Retno Murwanti, β€œThe radical scavenging activity of 2-2’ diphenyl -1- picrylhydrazil (DPPH) on the methanol extracts and Ethyl acetate fractions of red dragon fruit peel (Hylocereus polyrhizus (F.A.C.Weber) Britton dan Rose)”, ijp, vol. 9, no. 1, pp. 79–82, Mar. 2017.