1. IARC Monograph of the Evaluation of the Carcinogenic Risk of Chemicals to Humans: Silica, Some Silicates,1997
2. The quartz hazard: a variable entity annals;Donaldson;Occup. Hyg.,1998
3. U.S Code of Federal Regulations Title 29 Part 1910.1000 (29CFR1910) Table Z-3
4. Coal mineralogies by SEM automatic image analysis;Huggins,1980
5. Investigation of coal mineralogy and of mineral derivatives in coke and ash by Mössbauer spectroscopy and scanning electron microscopy-automatic image analysis;Huffman,1981