Chemical structure changes in coals after low-temperature oxidation and demineralization by acid treatment as revealed by high resolution solid state 13C NMR

1987 ◽  
Vol 15 ◽  
pp. 225-231 ◽  
Author(s):  
P. Tekely ◽  
D. Nicole ◽  
J.-j. Delpuech ◽  
E. Totino ◽  
J.F. Muller
1994 ◽  
Vol 26 (3) ◽  
pp. 267-271 ◽  
Author(s):  
Koichi Hatada ◽  
Koichi Ute ◽  
Hiroshi Okuda ◽  
F W Hein Kruger ◽  
Otto Vogl

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