Okik Hendriyanto Cahyonugroho, Euis Nurul Hidayah, Yayok Suryo Purnomo. “CHARACTERISATION OF NATURAL ORGANIC MATTER IN COAGULATION PROCESS BY USING SIZE EXCLUSION CHROMATOGRAPHY”. International Journal of Research Science and Management, vol. 2, no. 10, Oct. 2015, pp. 1-4, http://ijrsm.com/index.php/journal-ijrsm/article/view/646.