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Hiroshi Fujitsua, Isao Mochidaa, T.Vincent Verheyen*, Geoffrey J. Perry* and David J. Allardice
The influence of modifications to the surface groups of brown coal chars on their flue gas cleaning ability
Fuel
Volume 72, Issue 1, January 1993, Pages 109-113
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http://dx.doi.org/10.1016/0016-2361(93)90384-E 
