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Fatmawati, Linda and , Dr. Ir. Ahmad M. Fuadi, M.T. and , Kun Harismah, Ph.D. (2015) Preliminary of Precipitated Silica Plant from Sulphuric Acid and Sodium Silicate with Capacity of 45,000 ton/year. Skripsi thesis, Universitas Muhammadiyah Surakarta.