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Martha Riana Sitompul, Fidianto Suryana Suryana, Mahfud Mahfud, Donny Satria Bhuana. "Ekstraksi Asam Oksalat Pada Umbi Porang (Amorphophallus Oncophyllus) dengan Metode Mechanical Separation." Jurnal Teknik ITS 7.1 (2018)