[1]
R. M. D. . Saputri, P. M. . Aurellia, and D. S. . Perwitasari, “Reduction of Chrom Ion (Cr) With Ion Exchange Resin in Liquid Waste of Leather Tanning ”, Nusantara Sci. Tech. Proc., pp. 205–208, Nov. 2020, doi: 10.11594/nstp.2020.0532.