Yunia Mardianis (Department of Chemistry, Faculty of Mathmatics and Natural Sciences,Gadjah Mada University, Indonesia)
Chairil Anwar (Department of Chemistry, Faculty of Mathmatics and Natural Sciences,Gadjah Mada University, Indonesia)
Winarto Haryadi (Department of Chemistry, Faculty of Mathmatics and Natural Sciences,Gadjah Mada University, Indonesia)