[1] Huttinger, K.J., and Krauss, W., 1981. Catalytic activity of coal minerals in hydrogasification of coal. Fuel, Vol.60, pp. 93-102.
[2] Montano, P.A., Bommannavar, A.S., and Shah, V., 1981. Mossbauer study of transformations of pyrite under conditions of coal liquefaction. Fuel, Vol.60 , pp.703- 711.
[3] Tomita, A., Higashiyama, K, and Tamai, Y., 1981. Scanning electron microscopic study on the catalytic gasification of coal. Fuel, Vol.60, pp. 103-114.
[4] Mukherjee, S., Mahiuddin, S., Bprthakur, P., 2001. Demineralization and Desulfurizatipn of Subbituminous Coal with Hydrogen Peroxide. Energy Fuel, Vol.15 No.6, pp. 1418-1424.
[5] Karaca, H., Onal, Y., 2003. Demineralisation of Lignites by Single and Successive Pretreatment. Fuel, Vol.82, No.12, pp.1517-1522.
[6] Erol, M., Colduroglu, C., Aktas, Z., 2003. The Effect of Reagents and Reagent Mixtures on Froth Flotation of Coal Fines, Int J M?ner Process, Vol.71, No.1-4, pp.131-145.
[7] Polat, M., Polat, H., Chander, S., 2003. Physical and Chemical Interactions in Coal Flotation. Int J M?ner Process, Vol. 72, No.1-4, pp.199-213.
[8] Tao, D., Li, B., Johnson, S., 2002. A Flotation Study of Refuse Pond Coal Slurry. Fuel Process Technol, Vol.76, No.3, pp.201-210.
[9] Nugteren, H.W., Janssen-Jurkovicova, M.., Scarlett, B., 2002. Removal of heavy metals from fly ash and the impact on its quality. Journal of Chemical Technology & Biotechnology, Vol. 77, pp.389-395.
[10] Akers, D J., 1998. Major Changes in US Coal Prep. World Coal, Vol.7, pp.45– 49.
[11] Kazonich, G., and Kim, A.G., 1997. Leaching Fly Ash with Environmental and Extractive Lixiviants, 12th International Symposium on Coal Combustion By-Product Management and Use, American Coal Ash Assoc., Orlando, FL, 11-18.
[12] Kumar, M., Shankar, R.H., 2000. Removal of Ash from Indian Assam Coking Coal Using Sodium Hydroxide and Acid Solutions. Energy Sources, 22, pp.187-196.
[13] Lastra, R., Petruk, W., Wilson, J.,1998. Image analysis techniques and applications to mineral processing. In: Modern approaches to ore and environmental mineralogy. Mineralogical Association of Canada. Short Course Series, 27, 327-366.
[14] Gabas, S.G., Analise de Imagens Aplicada a Caracterizacao de Minerios – Analise Modal e Liberacao. Dissertacao de Mestrado, Escola Politecnica da Universidade deSao Paulo, 1999.
[15] Kahn, H., Sant’Agostino, L., Mano, E.S., Tassinari, M.M., 1998. Acta Microscopica.7-A, pp.241-244.
[16] Fruehan, R J., Li, Y., Brabie, L., 2003. .Dissolution of magnesite and dolomite in simulated EAF slags. Iron & Steel Society International Technology Conference and Exposition , Indianapolis, IN; USA; 27-30, pp.799-812.
[17] Romero, M and Rincon., J.M., 1999. Surface and bulk crystallization of glass-ceramic in the Na 2O-CaO-ZnO-PbO-Fe2 O3 -Al2 O3 -SiO2 system derived from a Goethite waste. Journal of the American Ceramic Society, Vol. 82, p.1313.
[18] Petruk, W., 2002. Imaging of minerals, ores and related products to determine mineral characteristics. Minerals and Metallurgical Processing, Vol.19, pp.50-56.
[19] Petruk, W., 1998. Image analysis for mineral beneficiation. J. Met. Vol.40, pp.29-31.
[20] Belkin, H. E., Zheng, B., and Finkelman, R. B., 1997. Fourth International Symposium on Environmental Geochemistry (U.S. Geological Survey, Reston, VA), U.S.Geological Survey Open-File Report, 97-496, 10.
[21] Belkin, H. E., Zheng, B., Zhou, D., and Finkelman, R. B., 1997. Fourteenth Annual International Pittsburgh Coal Conference, CD-ROM (University of Pittsburgh).
[22] Belkin, H. E., Warwick, P., Zheng, B., Zhou, D., and Finkelman, R. B.,1998. Fifteenth Annual International Pittsburgh Coal Conference, CD-ROM (University of Pittsburgh).
[23] Khan,M.A., Ahmad, I., M. Tariq Jan, M.T., and Karim, I., 2002. Mineral mater identification in some Pakistani coals. Fuel Processing Technology, Vol.75, pp.1-8.
[24] Landtwing, M.R., and Pettke, T., 2005. Relationships between SEMcathodoluminescence response and trace-element composition of hydrothermal vein quartz. American Mineralogist, Vol.90, pp.122-131.
[25] Mukherjee, S., Borthakur, P., 2004. Demineralization of Sub-bituminous High Sulphur Coal Using Mineral Acids. Fuel Process Technol., Vol. 85, No.2-3, pp.157-164.
[26] Gulen, J., Doymaz, I., Pi?kin, M., Ongen, S., Pi?kin, S., 2003. Leaching of Nall?han Lignites with some acid. Proceedings of the X. Balkan Mineral Processing Congress, Varna, Bulgaria.