Reliusman Dachi
Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada Sekip Utara BLS 21 Yogyakarta 55281 Indonesia Indonesia
Ikhsan Setiawan
Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada Sekip Utara BLS 21 Yogyakarta 55281 Indonesia Indonesia