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Ahmad Fauzi Pohan * Corresponding Author Sekolah Tinggi Teknologi Industri Padang Indonesia
Wiwit Suryanto http://wiwit.staff.ugm.ac.id Department of Physics, Faculty of Mathematic and Natural Sciences, Universitas Gadjah Mada Indonesia
Wahyudi Wahyudi Department of Physics, Faculty of Mathematic and Natural Sciences, Universitas Gadjah Mada Indonesia