1. Carpenter, A.M. 1995. Coal blending for power stations. IEA Coal Research 81, July 1995.
2. Homer, J.C., 1989. The continuous coal analyser: a new concept. EPRI Conference on Utility Applications of On-Line Coal Analysis. Pittsburgh, PA, USA.
3. Kirchner, A.T., 1991. On-line analysis of coal. IEA Coal Research 40, September 1991.
4. Knoll, G.F., 1989. Radiation Detection and Measurement. Wiley, Oxford, UK, 774pp.
5. Mineral matter in coals of different ranks from the Asturian Central basin;Martı́nez Tarazona;Fuel,1992