1. Laterites: Concept, Geology, Morphology and Chemistry;Aleva,1994
2. Characterization and analysis of porosity and pore structures;Anovitz;Rev. Mineral. Geochem.,2015
3. Standard test method for carbon and hydrogen in the analysis sample of coal and coke, D 3178-89,106,1993
4. Standard test method for sulphur in the analysis sample of coal and coke, d3177-89,1993
5. Standard test method for nitrogen in the analysis sample of coal and coke, D 3179,1993