Rahayu, Sri, Chemistry Department, Faculty of Mathematics and Natural Science, Universitas Negeri Medan (Indonesia)
Rahayu, Yayuk Putri, Department of Pharmacy, Universitas Muslim Nusantara Al Washliyah (Indonesia)
Rahim, Novia, Jurusan Pendidikan Kimia Fakultas Tarbiyah dan Keguruan Universitas Islam Negeri Sultan Syarif Kasim 28293 Kota Pekanbaru
Rahimah, Rahimah, Jurusan Teknik Kimia, Fakultas Teknik Universitas Riau
Rahmadhani, Amelia, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan (Indonesia)

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