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1.- Proceedings of the International Conference on coal science, 16-20 September1991,University of Newcastle-upon-Tyne, United Kingdom IEA Coal Research, ed.; Congreso - International Conference on Coal Science (1991. Newcastle, Reino Unido) Oxford: Butterworth-Heinemann, 1991 IV/5-3-15 Ver registro
2.- Understanding coal gasification Kristiansen, Alice London: IEA Coal Research, 1996 IEA Coal Research I/6-5-16 Ver registro
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