5Li Fengting, Ji Gending, Xue Gi. The Preparation of Inorganic Coagulant-Polyferric Sulfate. Journal Chemical Technology and Biotechnology, 1997, 68 (2): 219-221
6Derka. Manufacture of Ferric Sulphate Compounds. USA, US 5332565. 1994
7Kuznetsova N I, Likholobov V A, Gurrath M, et al. Promotion Effect of Carbon on the Oxidation of Ferrous Ions by Oxygen in the Presence of Sodium Nitrite. Applied Catalysis A: General, 1995, 128 (1), 41-52
