1. Asmatulu R. Acarkan N. Onal G. Celik M. S. (1995) in Proceedings of Technologies for Mineral Processing (Baia Mare, Romania), Upgrading of low-rank coals by low-temperature carbonization, pp 29–35.
2. Celik M. S. Somasundaran P. (1994) in Coal: Resources, Properties, Utilization and Pollution, Desulfurization of coal, ed Kural O. (Kurtis Press, Istanbul), pp 253–269.
3. Cole E. L. Ness H. V. Treatment of Solid Fuels. U.S. Patent 4,018,571, April 19, 1977 and U.S. Patent 4,052,169, October 4, 1977 (Texaco).
4. Ekinci E. (1982) in Proceedings of International Coal Technology Seminar Production Methods of Metallurgical Coke and Smokeless Fuel and its Application to Turkish Coals (In Turkish), pp 127–137.
5. Evans D. G. Sieman S. R. Separation of Water from Solid Organic Materials, U.S. Patent 3,552,031, January 5, 1979.