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Nugraha, Asep Wahyu, Chemistry Departement, Faculty of Mathematics and natural Sciences, Universitas Negeri Medan (Indonesia)
Nugraha, Asep Wahyu, Chemistry Department, Faculty of Mathematics and Sciences, Medan State University, Medan (Indonesia)
Nur, A Masrukhan, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Semarang State University, Semarang (Indonesia)
Nurfajriani, Nurfajriani, Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Medan
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