Saikia, Hemaprobha, and Jatindra Nath Ganguli. “Intercalation of Azo Dyes in Ni-Al Layered Double Hydroxides”. Asian Journal of Chemistry, vol. 24, no. 12, Aug. 2012, pp. 5909-13, https://asianpubs.org/index.php/ajchem/article/view/9996.