Kristianingrum, S., Siswani, E. D. and Suyanta, S. (2016) “MODIFICATION OF KELUD VOLCANIC ASH 2014 AS SELECTIVE ADSORBENT MATERIAL FOR COPPER(II) METAL ION”, Jurnal Sains Dasar, 5(1), pp. 7–16. doi: 10.21831/jsd.v5i1.12659.