Lina, Ruslan, Chemistry Department, Faculty of Mathematics and Natural Sciences, Tadulako University, Palu (Indonesia)
Lubis, Arinda Budiarti, Department of Chemistry, Faculty of Mathematics and natural Sciences, State University of Medan, Jl. Willem Iskandar Pasar V Estate, Medan 20221, Indonesia (Indonesia)
Lubis, Rizka Alfi Fadhilah, Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Medan (Indonesia)
Lubis, Syafrina Letare, Chemistry Department, Faculty of Mathematics and Natural Science, Universitas Negeri Medan (Indonesia)
Luthan, Putri Lynna A., Jurusan Teknik Sipil, Universitas Negeri Medan, Jl. Williem Iskandar, Medan

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