Warda Ningsih, Sherly Kasuma, Department of Chemistry, Faculty of Mathematics and Natural Sciences, State University of Padang, Padang, Indonesian (Indonesia)
Wardana, Dian, Jurusan Kimia FMIPA Universitas Negeri Medan
Wiliranti, Yuli Asih, Department of Chemistry, Faculty of Mathematic and Natural Science, Universitas Negeri Medan
Yelmida, Yelmida, Jurusan Teknik Kimia, Fakultas Teknik Universitas Riau
Yunanda, M Yogi, Department of Chemistry , Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang (Indonesia)

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