TY - SER AU - Bas,Serkan AU - Sakintuna,Billur AU - Sakintuna,Billur TI - Lyophilization- induced structural changes in solvent -swollen and supercritical carbon dioxide treated low-rank Turkish coals and characterization of their extracts KW - Solventes KW - Dióxido de carbono KW - Carbón ER -