1. Alpern B, Nahuys J, Martinez L. Mineral matter in ashy and non-washable coals – its influence on chemical properties. Symposium on Gondwana coals, Lisbon – proceedings and proceedings and papers 1984;70(2):299–317.
2. Benson SA, Laboratory studies of ash deposit formation during the combustion of Western U.S. coals. PhD Thesis, May 1987, Pennsylvania State University, p. 3-243.
3. Matching gasifiers to coal;Collet,2002
4. EPRI, Electric utility use of fireside additive, EPRI Final Report, CS-1318, Project 1035-1, 1980:III4.3–.5.
5. Gibb WH. The UK collaborative research programme on slagging pulverised coal-fired boilers: summary and findings. PowerGen, Power Technology, Nottingham NG11 OEE, England, Applications to Advanced Technology to ash-related problems in boilers, 1996. p. 41–65.