MULYATUN, Mulyatun. Synthesis of Low-Cost Adsorbent Based on Fly Ash for Heavy Metal Reduction of Cu and Cr In Textile Industrial Liquid Waste. Journal of Natural Sciences and Mathematics Research, [S. l.], v. 4, n. 2, p. 60–68, 2018. Disponível em: https://journal.walisongo.ac.id/index.php/JNSMR/article/view/11020. Acesso em: 27 jun. 2025.