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2. Tabor, D.: Gases, liquids and solids, (Penguin 1969)
3. Boiler operators handbook, (Graham & Trotmann 1981),National Industrial Fuel Efficiency Service Ltd
4. Green, S.F.: An acoustic technique for furnace temperature measurement, (CEGB, Marchwood 1984)
5. GREEN, S.F.: Private communication, Aug. 1984.