1. American Society for Testing and Materials, ASTM D1857-87. Standard Test Method for Fusibility of Coal and Coke Ash, 1987.
2. Australian Standards Association, AS1038.15-1987. Methods for the Analysis and Testing of Coal and Coke., Part 15, Fusibility of Higher Rank Coal Ash and Coke Ash. Sydney, 1987.
3. British Standards Institution, BS 1016: Part 15:1970, Methods for the Analysis and Testing of Coal and Coke, Part 15, Fusibility of Coal Ash and Coke Ash, London, 1970.
4. International Organisation For Standardization, ISO 540. Solid Mineral Fuels—Determination of Fusibility of Ash—High-Temperature Tube Method, Belgium, 1995.
5. Japanese Standards Association, JIS M 8801. Methods for Testing of Coal, 1979.