1. ASTM 1984 Standard D3172-89 Standard Practice for Proximate Analysis of Coal and Coke Annual Book of ASTM standards American Society of Testing and Materials
2. DIN 1978 51718 Bestimmung des Wassergehaltes Deutsche Industrie Normen
3. DIN 1978 51719 Bestimmung des Aschegehaltes Deutsche Industrie Normen
4. ASTM 2002 E870-8 D 3176-89 Standard Practise for Ultimate Analysis of Coal and Coke American Society of Testing and Materials
5. ASTM 2005 D3179-02e1 Standard Test Methods for Nitrogen in the Analysis Sample of Coal and Coke American Society of Testing and Materials