K. S. Ryoo, J.-H. Choi, and Y. P. Hong, “Comparison of Adsorptive Removal of Total Nitrogen (T-N) and Total Phosphorous (T-P) in Aqueous Solution using Granular Activated Charcoal (GAC)”, JAC, vol. 9, no. 1, pp. 1822–1836, Jan. 2013.