1. Aiken, G. R., McKnight, D. M., Wershaw, R. L., and MacCarthy, P., 1985,Humic Substances in Soil,Sediment, and Water: Geochemistry, Isolation and Characterization, John Wiley & Sons, New York, Chichester, Brisbane, Toronto, Singapore. pp. 1–86.
2. Influence of CaO and Na2CO3 as Additive on the Reduction of Hematite-Lignite Mixed Pellets.
3. Buffle, J. and van Leeuwen, H. P., 1992,Environmental Particles, New York: Lewis Publishers, pp. 1–576.