1. D. W. VAN KREVELEN, Coal, Elsevier, Amsterdam, 1961, p. 113.
2. Advances in Chemistry Series;P. H. Given,1966
3. R. H. ESSENHIGH, J. B. HOWARD, Combustion Phenomena in Coal Dusts and the Two-Component Hypothesis of Coal Constitution, Penn. State Univ. Studies No. 31, 1971, p. 17.
4. J. D. BLACKWOOD, D. J. McCARTY, Aust. J. Chem., 19 (1966) 797.
5. T. J. BIRCH, J. D. BLACKWOOD, Nature, 20 (1964) 797.