1. Characterisation of Spanish coal by means of Mössbauer spectroscopy;Ahmed;Fuel,1999
2. A MS, SEM-EDX and XRD study of Ti or Cu-doped zinc ferrites as regenerable sorbents for hot coal gas desulfurization;Ahmed;Appl. Surf. Sci.,2000
3. Standard classification of coals by rank (D388-82);ASTM (American Society for Testing and Materials),1983
4. Standard test method for moisture in the analysis sample of coal and coke (D3173-73);ASTM (American Society for Testing and Materials),1983
5. Standard test method for ash in the analysis sample of coal and coke from coal (D3174-82);ASTM (American Society for Testing and Materials),1983