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Wanri Lumbanraja * Corresponding Author Department of Physics, Universitas Gadjah Mada, Sekip Utara PO BOX BLS 21, 55281 Yogyakarta Indonesia
Kirbani Sri Brotopuspito Department of Physics, Universitas Gadjah Mada, Sekip Utara PO BOX BLS 21, 55281 Yogyakarta Indonesia