I. P. Sari, M. Said, and A. Lesbani, “Pillarization of layer double hydroxides (Mg/Al) with keggin type K4[α-SiW12O40]•nH2O and its application as adsorbent of procion red dye”, sci. technol. indones., vol. 2, no. 3, pp. 71–75, Jul. 2017.