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Kurniawan, Ekin Dwi Arif, Departmen of Chemistry, Faculty of Mathematics and Science, Universitas Negeri Medan (Indonesia)
Kurniawan, Ekin Dwi Arif, Department of Chemistry , Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan (Indonesia)
Kurniawan, Ekin Dwi Arif, Department of Chemistry, Faculty Of Mathematic and Natural Sciences, State University Of Medan (Indonesia)
Kurniawan, Ekin Dwi Arif, Department of Chemistry, Faculty of Mathematics and Natural Sciences, State University of Medan (Indonesia)
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