WASET
Astuti, W. , Prasetya, A. , Wahyuni, E. , Bendiyasa, I. (2013), 'The Effect of Unburned Carbon on Coal Fly Ash toward its Adsorption Capacity for Methyl Violet', World Academy of Science, Engineering and Technology, Open Science Index 78, International Journal of Chemical and Molecular Engineering, 7(6), 418 - 421.