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" Optimasi Konsentrasi Span 80 dan Lama Pengadukan dalam Preparasi Microspheres Metformin Hidroklorida-kitosan (Optimization of Span 80 Concentration and Stiring Time on The Preparation of Metformin Hydrochloride-Chitosan Microspheres )" <em>Pustaka Kesehatan</em> [Online], Volume 6 Number 1 (16 January 2018)