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Sembiring, Sindi H, Department of Chemistry, Faculty of Mathematics and Natural Sciences, State University of Medan (Indonesia)
Setiarso, Pirim, Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Negeri Surabaya, Jl. Ketintang Wiyata, No. 62,
Surabaya, 60231, East Java, Indonesia (Indonesia)
Siagian, ElySabet Pratiwi, Departemen Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Medan (Indonesia)
Siahaan, Ella Oktaviana, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan (Indonesia)
Siahaan, Riris, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan (Indonesia)
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