Hieu, N. D., C. T. Xuan, P. D. Thanh, and M. A. Tuan. “Review: Possible Removal of Heavy Metal and Selective Rare-Earth Ions by Polymeric and Nano-Composite Materials”. Vietnam Journal of Chemistry, vol. 54, no. 4, Aug. 2016, p. 401, doi:10.15625/0866-7144.2016-00337.