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Achmad Qodim Syafaatullah; Variyana, Y.; Ni’matur Rohmah; Iid Mufaidah; Ayu Qurota A’yun. Optimization of Ultrasound-Assisted Extraction Parameters from Indigofera Tinctoria L Using Response Surface Methodology. JOURNAL OF RESEARCH AND TECHNOLOGY 2021, 7, 175-186.